* computation, square-free factorization and rational function normalization. */
/*
- * GiNaC Copyright (C) 1999-2000 Johannes Gutenberg University Mainz, Germany
+ * GiNaC Copyright (C) 1999-2001 Johannes Gutenberg University Mainz, Germany
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* @return "false" if no symbol was found, "true" otherwise */
static bool get_first_symbol(const ex &e, const symbol *&x)
{
- if (is_ex_exactly_of_type(e, symbol)) {
- x = static_cast<symbol *>(e.bp);
- return true;
- } else if (is_ex_exactly_of_type(e, add) || is_ex_exactly_of_type(e, mul)) {
- for (unsigned i=0; i<e.nops(); i++)
- if (get_first_symbol(e.op(i), x))
- return true;
- } else if (is_ex_exactly_of_type(e, power)) {
- if (get_first_symbol(e.op(0), x))
- return true;
- }
- return false;
+ if (is_ex_exactly_of_type(e, symbol)) {
+ x = static_cast<symbol *>(e.bp);
+ return true;
+ } else if (is_ex_exactly_of_type(e, add) || is_ex_exactly_of_type(e, mul)) {
+ for (unsigned i=0; i<e.nops(); i++)
+ if (get_first_symbol(e.op(i), x))
+ return true;
+ } else if (is_ex_exactly_of_type(e, power)) {
+ if (get_first_symbol(e.op(0), x))
+ return true;
+ }
+ return false;
}
*
* @see get_symbol_stats */
struct sym_desc {
- /** Pointer to symbol */
- const symbol *sym;
+ /** Pointer to symbol */
+ const symbol *sym;
- /** Highest degree of symbol in polynomial "a" */
- int deg_a;
+ /** Highest degree of symbol in polynomial "a" */
+ int deg_a;
- /** Highest degree of symbol in polynomial "b" */
- int deg_b;
+ /** Highest degree of symbol in polynomial "b" */
+ int deg_b;
- /** Lowest degree of symbol in polynomial "a" */
- int ldeg_a;
+ /** Lowest degree of symbol in polynomial "a" */
+ int ldeg_a;
- /** Lowest degree of symbol in polynomial "b" */
- int ldeg_b;
+ /** Lowest degree of symbol in polynomial "b" */
+ int ldeg_b;
- /** Maximum of deg_a and deg_b (Used for sorting) */
- int max_deg;
+ /** Maximum of deg_a and deg_b (Used for sorting) */
+ int max_deg;
- /** Commparison operator for sorting */
- bool operator<(const sym_desc &x) const {return max_deg < x.max_deg;}
+ /** Commparison operator for sorting */
+ bool operator<(const sym_desc &x) const {return max_deg < x.max_deg;}
};
// Vector of sym_desc structures
// Add symbol the sym_desc_vec (used internally by get_symbol_stats())
static void add_symbol(const symbol *s, sym_desc_vec &v)
{
- sym_desc_vec::iterator it = v.begin(), itend = v.end();
- while (it != itend) {
- if (it->sym->compare(*s) == 0) // If it's already in there, don't add it a second time
- return;
- it++;
- }
- sym_desc d;
- d.sym = s;
- v.push_back(d);
+ sym_desc_vec::iterator it = v.begin(), itend = v.end();
+ while (it != itend) {
+ if (it->sym->compare(*s) == 0) // If it's already in there, don't add it a second time
+ return;
+ it++;
+ }
+ sym_desc d;
+ d.sym = s;
+ v.push_back(d);
}
// Collect all symbols of an expression (used internally by get_symbol_stats())
static void collect_symbols(const ex &e, sym_desc_vec &v)
{
- if (is_ex_exactly_of_type(e, symbol)) {
- add_symbol(static_cast<symbol *>(e.bp), v);
- } else if (is_ex_exactly_of_type(e, add) || is_ex_exactly_of_type(e, mul)) {
- for (unsigned i=0; i<e.nops(); i++)
- collect_symbols(e.op(i), v);
- } else if (is_ex_exactly_of_type(e, power)) {
- collect_symbols(e.op(0), v);
- }
+ if (is_ex_exactly_of_type(e, symbol)) {
+ add_symbol(static_cast<symbol *>(e.bp), v);
+ } else if (is_ex_exactly_of_type(e, add) || is_ex_exactly_of_type(e, mul)) {
+ for (unsigned i=0; i<e.nops(); i++)
+ collect_symbols(e.op(i), v);
+ } else if (is_ex_exactly_of_type(e, power)) {
+ collect_symbols(e.op(0), v);
+ }
}
/** Collect statistical information about symbols in polynomials.
* @param v vector of sym_desc structs (filled in) */
static void get_symbol_stats(const ex &a, const ex &b, sym_desc_vec &v)
{
- collect_symbols(a.eval(), v); // eval() to expand assigned symbols
- collect_symbols(b.eval(), v);
- sym_desc_vec::iterator it = v.begin(), itend = v.end();
- while (it != itend) {
- int deg_a = a.degree(*(it->sym));
- int deg_b = b.degree(*(it->sym));
- it->deg_a = deg_a;
- it->deg_b = deg_b;
- it->max_deg = max(deg_a, deg_b);
- it->ldeg_a = a.ldegree(*(it->sym));
- it->ldeg_b = b.ldegree(*(it->sym));
- it++;
- }
- sort(v.begin(), v.end());
+ collect_symbols(a.eval(), v); // eval() to expand assigned symbols
+ collect_symbols(b.eval(), v);
+ sym_desc_vec::iterator it = v.begin(), itend = v.end();
+ while (it != itend) {
+ int deg_a = a.degree(*(it->sym));
+ int deg_b = b.degree(*(it->sym));
+ it->deg_a = deg_a;
+ it->deg_b = deg_b;
+ it->max_deg = std::max(deg_a,deg_b);
+ it->ldeg_a = a.ldegree(*(it->sym));
+ it->ldeg_b = b.ldegree(*(it->sym));
+ it++;
+ }
+ sort(v.begin(), v.end());
#if 0
std::clog << "Symbols:\n";
it = v.begin(); itend = v.end();
// expression recursively (used internally by lcm_of_coefficients_denominators())
static numeric lcmcoeff(const ex &e, const numeric &l)
{
- if (e.info(info_flags::rational))
- return lcm(ex_to_numeric(e).denom(), l);
- else if (is_ex_exactly_of_type(e, add)) {
- numeric c = _num1();
- for (unsigned i=0; i<e.nops(); i++)
- c = lcmcoeff(e.op(i), c);
- return lcm(c, l);
- } else if (is_ex_exactly_of_type(e, mul)) {
- numeric c = _num1();
- for (unsigned i=0; i<e.nops(); i++)
- c *= lcmcoeff(e.op(i), _num1());
- return lcm(c, l);
- } else if (is_ex_exactly_of_type(e, power))
- return pow(lcmcoeff(e.op(0), l), ex_to_numeric(e.op(1)));
- return l;
+ if (e.info(info_flags::rational))
+ return lcm(ex_to_numeric(e).denom(), l);
+ else if (is_ex_exactly_of_type(e, add)) {
+ numeric c = _num1();
+ for (unsigned i=0; i<e.nops(); i++)
+ c = lcmcoeff(e.op(i), c);
+ return lcm(c, l);
+ } else if (is_ex_exactly_of_type(e, mul)) {
+ numeric c = _num1();
+ for (unsigned i=0; i<e.nops(); i++)
+ c *= lcmcoeff(e.op(i), _num1());
+ return lcm(c, l);
+ } else if (is_ex_exactly_of_type(e, power))
+ return pow(lcmcoeff(e.op(0), l), ex_to_numeric(e.op(1)));
+ return l;
}
/** Compute LCM of denominators of coefficients of a polynomial.
* @return LCM of denominators of coefficients */
static numeric lcm_of_coefficients_denominators(const ex &e)
{
- return lcmcoeff(e, _num1());
+ return lcmcoeff(e, _num1());
}
/** Bring polynomial from Q[X] to Z[X] by multiplying in the previously
* @return integer content */
numeric ex::integer_content(void) const
{
- GINAC_ASSERT(bp!=0);
- return bp->integer_content();
+ GINAC_ASSERT(bp!=0);
+ return bp->integer_content();
}
numeric basic::integer_content(void) const
{
- return _num1();
+ return _num1();
}
numeric numeric::integer_content(void) const
{
- return abs(*this);
+ return abs(*this);
}
numeric add::integer_content(void) const
{
- epvector::const_iterator it = seq.begin();
- epvector::const_iterator itend = seq.end();
- numeric c = _num0();
- while (it != itend) {
- GINAC_ASSERT(!is_ex_exactly_of_type(it->rest,numeric));
- GINAC_ASSERT(is_ex_exactly_of_type(it->coeff,numeric));
- c = gcd(ex_to_numeric(it->coeff), c);
- it++;
- }
- GINAC_ASSERT(is_ex_exactly_of_type(overall_coeff,numeric));
- c = gcd(ex_to_numeric(overall_coeff),c);
- return c;
+ epvector::const_iterator it = seq.begin();
+ epvector::const_iterator itend = seq.end();
+ numeric c = _num0();
+ while (it != itend) {
+ GINAC_ASSERT(!is_ex_exactly_of_type(it->rest,numeric));
+ GINAC_ASSERT(is_ex_exactly_of_type(it->coeff,numeric));
+ c = gcd(ex_to_numeric(it->coeff), c);
+ it++;
+ }
+ GINAC_ASSERT(is_ex_exactly_of_type(overall_coeff,numeric));
+ c = gcd(ex_to_numeric(overall_coeff),c);
+ return c;
}
numeric mul::integer_content(void) const
{
#ifdef DO_GINAC_ASSERT
- epvector::const_iterator it = seq.begin();
- epvector::const_iterator itend = seq.end();
- while (it != itend) {
- GINAC_ASSERT(!is_ex_exactly_of_type(recombine_pair_to_ex(*it),numeric));
- ++it;
- }
+ epvector::const_iterator it = seq.begin();
+ epvector::const_iterator itend = seq.end();
+ while (it != itend) {
+ GINAC_ASSERT(!is_ex_exactly_of_type(recombine_pair_to_ex(*it),numeric));
+ ++it;
+ }
#endif // def DO_GINAC_ASSERT
- GINAC_ASSERT(is_ex_exactly_of_type(overall_coeff,numeric));
- return abs(ex_to_numeric(overall_coeff));
+ GINAC_ASSERT(is_ex_exactly_of_type(overall_coeff,numeric));
+ return abs(ex_to_numeric(overall_coeff));
}
* @return quotient of a and b in Q[x] */
ex quo(const ex &a, const ex &b, const symbol &x, bool check_args)
{
- if (b.is_zero())
- throw(std::overflow_error("quo: division by zero"));
- if (is_ex_exactly_of_type(a, numeric) && is_ex_exactly_of_type(b, numeric))
- return a / b;
+ if (b.is_zero())
+ throw(std::overflow_error("quo: division by zero"));
+ if (is_ex_exactly_of_type(a, numeric) && is_ex_exactly_of_type(b, numeric))
+ return a / b;
#if FAST_COMPARE
- if (a.is_equal(b))
- return _ex1();
+ if (a.is_equal(b))
+ return _ex1();
#endif
- if (check_args && (!a.info(info_flags::rational_polynomial) || !b.info(info_flags::rational_polynomial)))
- throw(std::invalid_argument("quo: arguments must be polynomials over the rationals"));
-
- // Polynomial long division
- ex q = _ex0();
- ex r = a.expand();
- if (r.is_zero())
- return r;
- int bdeg = b.degree(x);
- int rdeg = r.degree(x);
- ex blcoeff = b.expand().coeff(x, bdeg);
- bool blcoeff_is_numeric = is_ex_exactly_of_type(blcoeff, numeric);
- while (rdeg >= bdeg) {
- ex term, rcoeff = r.coeff(x, rdeg);
- if (blcoeff_is_numeric)
- term = rcoeff / blcoeff;
- else {
- if (!divide(rcoeff, blcoeff, term, false))
- return *new ex(fail());
- }
- term *= power(x, rdeg - bdeg);
- q += term;
- r -= (term * b).expand();
- if (r.is_zero())
- break;
- rdeg = r.degree(x);
- }
- return q;
+ if (check_args && (!a.info(info_flags::rational_polynomial) || !b.info(info_flags::rational_polynomial)))
+ throw(std::invalid_argument("quo: arguments must be polynomials over the rationals"));
+
+ // Polynomial long division
+ ex q = _ex0();
+ ex r = a.expand();
+ if (r.is_zero())
+ return r;
+ int bdeg = b.degree(x);
+ int rdeg = r.degree(x);
+ ex blcoeff = b.expand().coeff(x, bdeg);
+ bool blcoeff_is_numeric = is_ex_exactly_of_type(blcoeff, numeric);
+ while (rdeg >= bdeg) {
+ ex term, rcoeff = r.coeff(x, rdeg);
+ if (blcoeff_is_numeric)
+ term = rcoeff / blcoeff;
+ else {
+ if (!divide(rcoeff, blcoeff, term, false))
+ return *new ex(fail());
+ }
+ term *= power(x, rdeg - bdeg);
+ q += term;
+ r -= (term * b).expand();
+ if (r.is_zero())
+ break;
+ rdeg = r.degree(x);
+ }
+ return q;
}
* @return remainder of a(x) and b(x) in Q[x] */
ex rem(const ex &a, const ex &b, const symbol &x, bool check_args)
{
- if (b.is_zero())
- throw(std::overflow_error("rem: division by zero"));
- if (is_ex_exactly_of_type(a, numeric)) {
- if (is_ex_exactly_of_type(b, numeric))
- return _ex0();
- else
- return b;
- }
+ if (b.is_zero())
+ throw(std::overflow_error("rem: division by zero"));
+ if (is_ex_exactly_of_type(a, numeric)) {
+ if (is_ex_exactly_of_type(b, numeric))
+ return _ex0();
+ else
+ return b;
+ }
#if FAST_COMPARE
- if (a.is_equal(b))
- return _ex0();
+ if (a.is_equal(b))
+ return _ex0();
#endif
- if (check_args && (!a.info(info_flags::rational_polynomial) || !b.info(info_flags::rational_polynomial)))
- throw(std::invalid_argument("rem: arguments must be polynomials over the rationals"));
-
- // Polynomial long division
- ex r = a.expand();
- if (r.is_zero())
- return r;
- int bdeg = b.degree(x);
- int rdeg = r.degree(x);
- ex blcoeff = b.expand().coeff(x, bdeg);
- bool blcoeff_is_numeric = is_ex_exactly_of_type(blcoeff, numeric);
- while (rdeg >= bdeg) {
- ex term, rcoeff = r.coeff(x, rdeg);
- if (blcoeff_is_numeric)
- term = rcoeff / blcoeff;
- else {
- if (!divide(rcoeff, blcoeff, term, false))
- return *new ex(fail());
- }
- term *= power(x, rdeg - bdeg);
- r -= (term * b).expand();
- if (r.is_zero())
- break;
- rdeg = r.degree(x);
- }
- return r;
+ if (check_args && (!a.info(info_flags::rational_polynomial) || !b.info(info_flags::rational_polynomial)))
+ throw(std::invalid_argument("rem: arguments must be polynomials over the rationals"));
+
+ // Polynomial long division
+ ex r = a.expand();
+ if (r.is_zero())
+ return r;
+ int bdeg = b.degree(x);
+ int rdeg = r.degree(x);
+ ex blcoeff = b.expand().coeff(x, bdeg);
+ bool blcoeff_is_numeric = is_ex_exactly_of_type(blcoeff, numeric);
+ while (rdeg >= bdeg) {
+ ex term, rcoeff = r.coeff(x, rdeg);
+ if (blcoeff_is_numeric)
+ term = rcoeff / blcoeff;
+ else {
+ if (!divide(rcoeff, blcoeff, term, false))
+ return *new ex(fail());
+ }
+ term *= power(x, rdeg - bdeg);
+ r -= (term * b).expand();
+ if (r.is_zero())
+ break;
+ rdeg = r.degree(x);
+ }
+ return r;
}
* @return pseudo-remainder of a(x) and b(x) in Z[x] */
ex prem(const ex &a, const ex &b, const symbol &x, bool check_args)
{
- if (b.is_zero())
- throw(std::overflow_error("prem: division by zero"));
- if (is_ex_exactly_of_type(a, numeric)) {
- if (is_ex_exactly_of_type(b, numeric))
- return _ex0();
- else
- return b;
- }
- if (check_args && (!a.info(info_flags::rational_polynomial) || !b.info(info_flags::rational_polynomial)))
- throw(std::invalid_argument("prem: arguments must be polynomials over the rationals"));
-
- // Polynomial long division
- ex r = a.expand();
- ex eb = b.expand();
- int rdeg = r.degree(x);
- int bdeg = eb.degree(x);
- ex blcoeff;
- if (bdeg <= rdeg) {
- blcoeff = eb.coeff(x, bdeg);
- if (bdeg == 0)
- eb = _ex0();
- else
- eb -= blcoeff * power(x, bdeg);
- } else
- blcoeff = _ex1();
-
- int delta = rdeg - bdeg + 1, i = 0;
- while (rdeg >= bdeg && !r.is_zero()) {
- ex rlcoeff = r.coeff(x, rdeg);
- ex term = (power(x, rdeg - bdeg) * eb * rlcoeff).expand();
- if (rdeg == 0)
- r = _ex0();
- else
- r -= rlcoeff * power(x, rdeg);
- r = (blcoeff * r).expand() - term;
- rdeg = r.degree(x);
- i++;
- }
- return power(blcoeff, delta - i) * r;
+ if (b.is_zero())
+ throw(std::overflow_error("prem: division by zero"));
+ if (is_ex_exactly_of_type(a, numeric)) {
+ if (is_ex_exactly_of_type(b, numeric))
+ return _ex0();
+ else
+ return b;
+ }
+ if (check_args && (!a.info(info_flags::rational_polynomial) || !b.info(info_flags::rational_polynomial)))
+ throw(std::invalid_argument("prem: arguments must be polynomials over the rationals"));
+
+ // Polynomial long division
+ ex r = a.expand();
+ ex eb = b.expand();
+ int rdeg = r.degree(x);
+ int bdeg = eb.degree(x);
+ ex blcoeff;
+ if (bdeg <= rdeg) {
+ blcoeff = eb.coeff(x, bdeg);
+ if (bdeg == 0)
+ eb = _ex0();
+ else
+ eb -= blcoeff * power(x, bdeg);
+ } else
+ blcoeff = _ex1();
+
+ int delta = rdeg - bdeg + 1, i = 0;
+ while (rdeg >= bdeg && !r.is_zero()) {
+ ex rlcoeff = r.coeff(x, rdeg);
+ ex term = (power(x, rdeg - bdeg) * eb * rlcoeff).expand();
+ if (rdeg == 0)
+ r = _ex0();
+ else
+ r -= rlcoeff * power(x, rdeg);
+ r = (blcoeff * r).expand() - term;
+ rdeg = r.degree(x);
+ i++;
+ }
+ return power(blcoeff, delta - i) * r;
}
ex sprem(const ex &a, const ex &b, const symbol &x, bool check_args)
{
- if (b.is_zero())
- throw(std::overflow_error("prem: division by zero"));
- if (is_ex_exactly_of_type(a, numeric)) {
- if (is_ex_exactly_of_type(b, numeric))
- return _ex0();
- else
- return b;
- }
- if (check_args && (!a.info(info_flags::rational_polynomial) || !b.info(info_flags::rational_polynomial)))
- throw(std::invalid_argument("prem: arguments must be polynomials over the rationals"));
-
- // Polynomial long division
- ex r = a.expand();
- ex eb = b.expand();
- int rdeg = r.degree(x);
- int bdeg = eb.degree(x);
- ex blcoeff;
- if (bdeg <= rdeg) {
- blcoeff = eb.coeff(x, bdeg);
- if (bdeg == 0)
- eb = _ex0();
- else
- eb -= blcoeff * power(x, bdeg);
- } else
- blcoeff = _ex1();
-
- while (rdeg >= bdeg && !r.is_zero()) {
- ex rlcoeff = r.coeff(x, rdeg);
- ex term = (power(x, rdeg - bdeg) * eb * rlcoeff).expand();
- if (rdeg == 0)
- r = _ex0();
- else
- r -= rlcoeff * power(x, rdeg);
- r = (blcoeff * r).expand() - term;
- rdeg = r.degree(x);
- }
- return r;
+ if (b.is_zero())
+ throw(std::overflow_error("prem: division by zero"));
+ if (is_ex_exactly_of_type(a, numeric)) {
+ if (is_ex_exactly_of_type(b, numeric))
+ return _ex0();
+ else
+ return b;
+ }
+ if (check_args && (!a.info(info_flags::rational_polynomial) || !b.info(info_flags::rational_polynomial)))
+ throw(std::invalid_argument("prem: arguments must be polynomials over the rationals"));
+
+ // Polynomial long division
+ ex r = a.expand();
+ ex eb = b.expand();
+ int rdeg = r.degree(x);
+ int bdeg = eb.degree(x);
+ ex blcoeff;
+ if (bdeg <= rdeg) {
+ blcoeff = eb.coeff(x, bdeg);
+ if (bdeg == 0)
+ eb = _ex0();
+ else
+ eb -= blcoeff * power(x, bdeg);
+ } else
+ blcoeff = _ex1();
+
+ while (rdeg >= bdeg && !r.is_zero()) {
+ ex rlcoeff = r.coeff(x, rdeg);
+ ex term = (power(x, rdeg - bdeg) * eb * rlcoeff).expand();
+ if (rdeg == 0)
+ r = _ex0();
+ else
+ r -= rlcoeff * power(x, rdeg);
+ r = (blcoeff * r).expand() - term;
+ rdeg = r.degree(x);
+ }
+ return r;
}
* "false" otherwise */
bool divide(const ex &a, const ex &b, ex &q, bool check_args)
{
- q = _ex0();
- if (b.is_zero())
- throw(std::overflow_error("divide: division by zero"));
- if (a.is_zero())
- return true;
- if (is_ex_exactly_of_type(b, numeric)) {
- q = a / b;
- return true;
- } else if (is_ex_exactly_of_type(a, numeric))
- return false;
+ q = _ex0();
+ if (b.is_zero())
+ throw(std::overflow_error("divide: division by zero"));
+ if (a.is_zero())
+ return true;
+ if (is_ex_exactly_of_type(b, numeric)) {
+ q = a / b;
+ return true;
+ } else if (is_ex_exactly_of_type(a, numeric))
+ return false;
#if FAST_COMPARE
- if (a.is_equal(b)) {
- q = _ex1();
- return true;
- }
+ if (a.is_equal(b)) {
+ q = _ex1();
+ return true;
+ }
#endif
- if (check_args && (!a.info(info_flags::rational_polynomial) ||
- !b.info(info_flags::rational_polynomial)))
- throw(std::invalid_argument("divide: arguments must be polynomials over the rationals"));
-
- // Find first symbol
- const symbol *x;
- if (!get_first_symbol(a, x) && !get_first_symbol(b, x))
- throw(std::invalid_argument("invalid expression in divide()"));
-
- // Polynomial long division (recursive)
- ex r = a.expand();
- if (r.is_zero())
- return true;
- int bdeg = b.degree(*x);
- int rdeg = r.degree(*x);
- ex blcoeff = b.expand().coeff(*x, bdeg);
- bool blcoeff_is_numeric = is_ex_exactly_of_type(blcoeff, numeric);
- while (rdeg >= bdeg) {
- ex term, rcoeff = r.coeff(*x, rdeg);
- if (blcoeff_is_numeric)
- term = rcoeff / blcoeff;
- else
- if (!divide(rcoeff, blcoeff, term, false))
- return false;
- term *= power(*x, rdeg - bdeg);
- q += term;
- r -= (term * b).expand();
- if (r.is_zero())
- return true;
- rdeg = r.degree(*x);
- }
- return false;
+ if (check_args && (!a.info(info_flags::rational_polynomial) ||
+ !b.info(info_flags::rational_polynomial)))
+ throw(std::invalid_argument("divide: arguments must be polynomials over the rationals"));
+
+ // Find first symbol
+ const symbol *x;
+ if (!get_first_symbol(a, x) && !get_first_symbol(b, x))
+ throw(std::invalid_argument("invalid expression in divide()"));
+
+ // Polynomial long division (recursive)
+ ex r = a.expand();
+ if (r.is_zero())
+ return true;
+ int bdeg = b.degree(*x);
+ int rdeg = r.degree(*x);
+ ex blcoeff = b.expand().coeff(*x, bdeg);
+ bool blcoeff_is_numeric = is_ex_exactly_of_type(blcoeff, numeric);
+ while (rdeg >= bdeg) {
+ ex term, rcoeff = r.coeff(*x, rdeg);
+ if (blcoeff_is_numeric)
+ term = rcoeff / blcoeff;
+ else
+ if (!divide(rcoeff, blcoeff, term, false))
+ return false;
+ term *= power(*x, rdeg - bdeg);
+ q += term;
+ r -= (term * b).expand();
+ if (r.is_zero())
+ return true;
+ rdeg = r.degree(*x);
+ }
+ return false;
}
typedef std::pair<ex, bool> exbool;
struct ex2_less {
- bool operator() (const ex2 p, const ex2 q) const
- {
- return p.first.compare(q.first) < 0 || (!(q.first.compare(p.first) < 0) && p.second.compare(q.second) < 0);
- }
+ bool operator() (const ex2 p, const ex2 q) const
+ {
+ return p.first.compare(q.first) < 0 || (!(q.first.compare(p.first) < 0) && p.second.compare(q.second) < 0);
+ }
};
typedef std::map<ex2, exbool, ex2_less> ex2_exbool_remember;
* @see get_symbol_stats, heur_gcd */
static bool divide_in_z(const ex &a, const ex &b, ex &q, sym_desc_vec::const_iterator var)
{
- q = _ex0();
- if (b.is_zero())
- throw(std::overflow_error("divide_in_z: division by zero"));
- if (b.is_equal(_ex1())) {
- q = a;
- return true;
- }
- if (is_ex_exactly_of_type(a, numeric)) {
- if (is_ex_exactly_of_type(b, numeric)) {
- q = a / b;
- return q.info(info_flags::integer);
- } else
- return false;
- }
+ q = _ex0();
+ if (b.is_zero())
+ throw(std::overflow_error("divide_in_z: division by zero"));
+ if (b.is_equal(_ex1())) {
+ q = a;
+ return true;
+ }
+ if (is_ex_exactly_of_type(a, numeric)) {
+ if (is_ex_exactly_of_type(b, numeric)) {
+ q = a / b;
+ return q.info(info_flags::integer);
+ } else
+ return false;
+ }
#if FAST_COMPARE
- if (a.is_equal(b)) {
- q = _ex1();
- return true;
- }
+ if (a.is_equal(b)) {
+ q = _ex1();
+ return true;
+ }
#endif
#if USE_REMEMBER
- // Remembering
- static ex2_exbool_remember dr_remember;
- ex2_exbool_remember::const_iterator remembered = dr_remember.find(ex2(a, b));
- if (remembered != dr_remember.end()) {
- q = remembered->second.first;
- return remembered->second.second;
- }
+ // Remembering
+ static ex2_exbool_remember dr_remember;
+ ex2_exbool_remember::const_iterator remembered = dr_remember.find(ex2(a, b));
+ if (remembered != dr_remember.end()) {
+ q = remembered->second.first;
+ return remembered->second.second;
+ }
#endif
- // Main symbol
- const symbol *x = var->sym;
+ // Main symbol
+ const symbol *x = var->sym;
- // Compare degrees
- int adeg = a.degree(*x), bdeg = b.degree(*x);
- if (bdeg > adeg)
- return false;
+ // Compare degrees
+ int adeg = a.degree(*x), bdeg = b.degree(*x);
+ if (bdeg > adeg)
+ return false;
#if USE_TRIAL_DIVISION
- // Trial division with polynomial interpolation
- int i, k;
-
- // Compute values at evaluation points 0..adeg
- vector<numeric> alpha; alpha.reserve(adeg + 1);
- exvector u; u.reserve(adeg + 1);
- numeric point = _num0();
- ex c;
- for (i=0; i<=adeg; i++) {
- ex bs = b.subs(*x == point);
- while (bs.is_zero()) {
- point += _num1();
- bs = b.subs(*x == point);
- }
- if (!divide_in_z(a.subs(*x == point), bs, c, var+1))
- return false;
- alpha.push_back(point);
- u.push_back(c);
- point += _num1();
- }
-
- // Compute inverses
- vector<numeric> rcp; rcp.reserve(adeg + 1);
- rcp.push_back(_num0());
- for (k=1; k<=adeg; k++) {
- numeric product = alpha[k] - alpha[0];
- for (i=1; i<k; i++)
- product *= alpha[k] - alpha[i];
- rcp.push_back(product.inverse());
- }
-
- // Compute Newton coefficients
- exvector v; v.reserve(adeg + 1);
- v.push_back(u[0]);
- for (k=1; k<=adeg; k++) {
- ex temp = v[k - 1];
- for (i=k-2; i>=0; i--)
- temp = temp * (alpha[k] - alpha[i]) + v[i];
- v.push_back((u[k] - temp) * rcp[k]);
- }
-
- // Convert from Newton form to standard form
- c = v[adeg];
- for (k=adeg-1; k>=0; k--)
- c = c * (*x - alpha[k]) + v[k];
-
- if (c.degree(*x) == (adeg - bdeg)) {
- q = c.expand();
- return true;
- } else
- return false;
+ // Trial division with polynomial interpolation
+ int i, k;
+
+ // Compute values at evaluation points 0..adeg
+ vector<numeric> alpha; alpha.reserve(adeg + 1);
+ exvector u; u.reserve(adeg + 1);
+ numeric point = _num0();
+ ex c;
+ for (i=0; i<=adeg; i++) {
+ ex bs = b.subs(*x == point);
+ while (bs.is_zero()) {
+ point += _num1();
+ bs = b.subs(*x == point);
+ }
+ if (!divide_in_z(a.subs(*x == point), bs, c, var+1))
+ return false;
+ alpha.push_back(point);
+ u.push_back(c);
+ point += _num1();
+ }
+
+ // Compute inverses
+ vector<numeric> rcp; rcp.reserve(adeg + 1);
+ rcp.push_back(_num0());
+ for (k=1; k<=adeg; k++) {
+ numeric product = alpha[k] - alpha[0];
+ for (i=1; i<k; i++)
+ product *= alpha[k] - alpha[i];
+ rcp.push_back(product.inverse());
+ }
+
+ // Compute Newton coefficients
+ exvector v; v.reserve(adeg + 1);
+ v.push_back(u[0]);
+ for (k=1; k<=adeg; k++) {
+ ex temp = v[k - 1];
+ for (i=k-2; i>=0; i--)
+ temp = temp * (alpha[k] - alpha[i]) + v[i];
+ v.push_back((u[k] - temp) * rcp[k]);
+ }
+
+ // Convert from Newton form to standard form
+ c = v[adeg];
+ for (k=adeg-1; k>=0; k--)
+ c = c * (*x - alpha[k]) + v[k];
+
+ if (c.degree(*x) == (adeg - bdeg)) {
+ q = c.expand();
+ return true;
+ } else
+ return false;
#else
- // Polynomial long division (recursive)
- ex r = a.expand();
- if (r.is_zero())
- return true;
- int rdeg = adeg;
- ex eb = b.expand();
- ex blcoeff = eb.coeff(*x, bdeg);
- while (rdeg >= bdeg) {
- ex term, rcoeff = r.coeff(*x, rdeg);
- if (!divide_in_z(rcoeff, blcoeff, term, var+1))
- break;
- term = (term * power(*x, rdeg - bdeg)).expand();
- q += term;
- r -= (term * eb).expand();
- if (r.is_zero()) {
+ // Polynomial long division (recursive)
+ ex r = a.expand();
+ if (r.is_zero())
+ return true;
+ int rdeg = adeg;
+ ex eb = b.expand();
+ ex blcoeff = eb.coeff(*x, bdeg);
+ while (rdeg >= bdeg) {
+ ex term, rcoeff = r.coeff(*x, rdeg);
+ if (!divide_in_z(rcoeff, blcoeff, term, var+1))
+ break;
+ term = (term * power(*x, rdeg - bdeg)).expand();
+ q += term;
+ r -= (term * eb).expand();
+ if (r.is_zero()) {
#if USE_REMEMBER
- dr_remember[ex2(a, b)] = exbool(q, true);
+ dr_remember[ex2(a, b)] = exbool(q, true);
#endif
- return true;
- }
- rdeg = r.degree(*x);
- }
+ return true;
+ }
+ rdeg = r.degree(*x);
+ }
#if USE_REMEMBER
- dr_remember[ex2(a, b)] = exbool(q, false);
+ dr_remember[ex2(a, b)] = exbool(q, false);
#endif
- return false;
+ return false;
#endif
}
* @see ex::content, ex::primpart */
ex ex::unit(const symbol &x) const
{
- ex c = expand().lcoeff(x);
- if (is_ex_exactly_of_type(c, numeric))
- return c < _ex0() ? _ex_1() : _ex1();
- else {
- const symbol *y;
- if (get_first_symbol(c, y))
- return c.unit(*y);
- else
- throw(std::invalid_argument("invalid expression in unit()"));
- }
+ ex c = expand().lcoeff(x);
+ if (is_ex_exactly_of_type(c, numeric))
+ return c < _ex0() ? _ex_1() : _ex1();
+ else {
+ const symbol *y;
+ if (get_first_symbol(c, y))
+ return c.unit(*y);
+ else
+ throw(std::invalid_argument("invalid expression in unit()"));
+ }
}
* @see ex::unit, ex::primpart */
ex ex::content(const symbol &x) const
{
- if (is_zero())
- return _ex0();
- if (is_ex_exactly_of_type(*this, numeric))
- return info(info_flags::negative) ? -*this : *this;
- ex e = expand();
- if (e.is_zero())
- return _ex0();
-
- // First, try the integer content
- ex c = e.integer_content();
- ex r = e / c;
- ex lcoeff = r.lcoeff(x);
- if (lcoeff.info(info_flags::integer))
- return c;
-
- // GCD of all coefficients
- int deg = e.degree(x);
- int ldeg = e.ldegree(x);
- if (deg == ldeg)
- return e.lcoeff(x) / e.unit(x);
- c = _ex0();
- for (int i=ldeg; i<=deg; i++)
- c = gcd(e.coeff(x, i), c, NULL, NULL, false);
- return c;
+ if (is_zero())
+ return _ex0();
+ if (is_ex_exactly_of_type(*this, numeric))
+ return info(info_flags::negative) ? -*this : *this;
+ ex e = expand();
+ if (e.is_zero())
+ return _ex0();
+
+ // First, try the integer content
+ ex c = e.integer_content();
+ ex r = e / c;
+ ex lcoeff = r.lcoeff(x);
+ if (lcoeff.info(info_flags::integer))
+ return c;
+
+ // GCD of all coefficients
+ int deg = e.degree(x);
+ int ldeg = e.ldegree(x);
+ if (deg == ldeg)
+ return e.lcoeff(x) / e.unit(x);
+ c = _ex0();
+ for (int i=ldeg; i<=deg; i++)
+ c = gcd(e.coeff(x, i), c, NULL, NULL, false);
+ return c;
}
* @see ex::unit, ex::content */
ex ex::primpart(const symbol &x) const
{
- if (is_zero())
- return _ex0();
- if (is_ex_exactly_of_type(*this, numeric))
- return _ex1();
-
- ex c = content(x);
- if (c.is_zero())
- return _ex0();
- ex u = unit(x);
- if (is_ex_exactly_of_type(c, numeric))
- return *this / (c * u);
- else
- return quo(*this, c * u, x, false);
+ if (is_zero())
+ return _ex0();
+ if (is_ex_exactly_of_type(*this, numeric))
+ return _ex1();
+
+ ex c = content(x);
+ if (c.is_zero())
+ return _ex0();
+ ex u = unit(x);
+ if (is_ex_exactly_of_type(c, numeric))
+ return *this / (c * u);
+ else
+ return quo(*this, c * u, x, false);
}
* @return primitive part */
ex ex::primpart(const symbol &x, const ex &c) const
{
- if (is_zero())
- return _ex0();
- if (c.is_zero())
- return _ex0();
- if (is_ex_exactly_of_type(*this, numeric))
- return _ex1();
-
- ex u = unit(x);
- if (is_ex_exactly_of_type(c, numeric))
- return *this / (c * u);
- else
- return quo(*this, c * u, x, false);
+ if (is_zero())
+ return _ex0();
+ if (c.is_zero())
+ return _ex0();
+ if (is_ex_exactly_of_type(*this, numeric))
+ return _ex1();
+
+ ex u = unit(x);
+ if (is_ex_exactly_of_type(c, numeric))
+ return *this / (c * u);
+ else
+ return quo(*this, c * u, x, false);
}
{
//std::clog << "eu_gcd(" << a << "," << b << ")\n";
- // Sort c and d so that c has higher degree
- ex c, d;
- int adeg = a.degree(*x), bdeg = b.degree(*x);
- if (adeg >= bdeg) {
- c = a;
- d = b;
- } else {
- c = b;
- d = a;
- }
+ // Sort c and d so that c has higher degree
+ ex c, d;
+ int adeg = a.degree(*x), bdeg = b.degree(*x);
+ if (adeg >= bdeg) {
+ c = a;
+ d = b;
+ } else {
+ c = b;
+ d = a;
+ }
// Normalize in Q[x]
c = c / c.lcoeff(*x);
d = d / d.lcoeff(*x);
// Euclidean algorithm
- ex r;
- for (;;) {
+ ex r;
+ for (;;) {
//std::clog << " d = " << d << endl;
- r = rem(c, d, *x, false);
- if (r.is_zero())
- return d / d.lcoeff(*x);
- c = d;
+ r = rem(c, d, *x, false);
+ if (r.is_zero())
+ return d / d.lcoeff(*x);
+ c = d;
d = r;
- }
+ }
}
{
//std::clog << "euprem_gcd(" << a << "," << b << ")\n";
- // Sort c and d so that c has higher degree
- ex c, d;
- int adeg = a.degree(*x), bdeg = b.degree(*x);
- if (adeg >= bdeg) {
- c = a;
- d = b;
- } else {
- c = b;
- d = a;
- }
+ // Sort c and d so that c has higher degree
+ ex c, d;
+ int adeg = a.degree(*x), bdeg = b.degree(*x);
+ if (adeg >= bdeg) {
+ c = a;
+ d = b;
+ } else {
+ c = b;
+ d = a;
+ }
// Calculate GCD of contents
ex gamma = gcd(c.content(*x), d.content(*x), NULL, NULL, false);
// Euclidean algorithm with pseudo-remainders
- ex r;
- for (;;) {
+ ex r;
+ for (;;) {
//std::clog << " d = " << d << endl;
- r = prem(c, d, *x, false);
- if (r.is_zero())
- return d.primpart(*x) * gamma;
- c = d;
+ r = prem(c, d, *x, false);
+ if (r.is_zero())
+ return d.primpart(*x) * gamma;
+ c = d;
d = r;
- }
+ }
}
{
//std::clog << "peu_gcd(" << a << "," << b << ")\n";
- // Sort c and d so that c has higher degree
- ex c, d;
- int adeg = a.degree(*x), bdeg = b.degree(*x);
- int ddeg;
- if (adeg >= bdeg) {
- c = a;
- d = b;
- ddeg = bdeg;
- } else {
- c = b;
- d = a;
- ddeg = adeg;
- }
-
- // Remove content from c and d, to be attached to GCD later
- ex cont_c = c.content(*x);
- ex cont_d = d.content(*x);
- ex gamma = gcd(cont_c, cont_d, NULL, NULL, false);
- if (ddeg == 0)
- return gamma;
- c = c.primpart(*x, cont_c);
- d = d.primpart(*x, cont_d);
-
- // Euclidean algorithm with content removal
+ // Sort c and d so that c has higher degree
+ ex c, d;
+ int adeg = a.degree(*x), bdeg = b.degree(*x);
+ int ddeg;
+ if (adeg >= bdeg) {
+ c = a;
+ d = b;
+ ddeg = bdeg;
+ } else {
+ c = b;
+ d = a;
+ ddeg = adeg;
+ }
+
+ // Remove content from c and d, to be attached to GCD later
+ ex cont_c = c.content(*x);
+ ex cont_d = d.content(*x);
+ ex gamma = gcd(cont_c, cont_d, NULL, NULL, false);
+ if (ddeg == 0)
+ return gamma;
+ c = c.primpart(*x, cont_c);
+ d = d.primpart(*x, cont_d);
+
+ // Euclidean algorithm with content removal
ex r;
- for (;;) {
+ for (;;) {
//std::clog << " d = " << d << endl;
- r = prem(c, d, *x, false);
- if (r.is_zero())
- return gamma * d;
- c = d;
+ r = prem(c, d, *x, false);
+ if (r.is_zero())
+ return gamma * d;
+ c = d;
d = r.primpart(*x);
- }
+ }
}
{
//std::clog << "red_gcd(" << a << "," << b << ")\n";
- // Sort c and d so that c has higher degree
- ex c, d;
- int adeg = a.degree(*x), bdeg = b.degree(*x);
- int cdeg, ddeg;
- if (adeg >= bdeg) {
- c = a;
- d = b;
- cdeg = adeg;
- ddeg = bdeg;
- } else {
- c = b;
- d = a;
- cdeg = bdeg;
- ddeg = adeg;
- }
-
- // Remove content from c and d, to be attached to GCD later
- ex cont_c = c.content(*x);
- ex cont_d = d.content(*x);
- ex gamma = gcd(cont_c, cont_d, NULL, NULL, false);
- if (ddeg == 0)
- return gamma;
- c = c.primpart(*x, cont_c);
- d = d.primpart(*x, cont_d);
-
- // First element of divisor sequence
- ex r, ri = _ex1();
- int delta = cdeg - ddeg;
-
- for (;;) {
- // Calculate polynomial pseudo-remainder
+ // Sort c and d so that c has higher degree
+ ex c, d;
+ int adeg = a.degree(*x), bdeg = b.degree(*x);
+ int cdeg, ddeg;
+ if (adeg >= bdeg) {
+ c = a;
+ d = b;
+ cdeg = adeg;
+ ddeg = bdeg;
+ } else {
+ c = b;
+ d = a;
+ cdeg = bdeg;
+ ddeg = adeg;
+ }
+
+ // Remove content from c and d, to be attached to GCD later
+ ex cont_c = c.content(*x);
+ ex cont_d = d.content(*x);
+ ex gamma = gcd(cont_c, cont_d, NULL, NULL, false);
+ if (ddeg == 0)
+ return gamma;
+ c = c.primpart(*x, cont_c);
+ d = d.primpart(*x, cont_d);
+
+ // First element of divisor sequence
+ ex r, ri = _ex1();
+ int delta = cdeg - ddeg;
+
+ for (;;) {
+ // Calculate polynomial pseudo-remainder
//std::clog << " d = " << d << endl;
- r = prem(c, d, *x, false);
- if (r.is_zero())
- return gamma * d.primpart(*x);
- c = d;
- cdeg = ddeg;
-
- if (!divide(r, pow(ri, delta), d, false))
- throw(std::runtime_error("invalid expression in red_gcd(), division failed"));
- ddeg = d.degree(*x);
- if (ddeg == 0) {
- if (is_ex_exactly_of_type(r, numeric))
- return gamma;
- else
- return gamma * r.primpart(*x);
- }
-
- ri = c.expand().lcoeff(*x);
- delta = cdeg - ddeg;
- }
+ r = prem(c, d, *x, false);
+ if (r.is_zero())
+ return gamma * d.primpart(*x);
+ c = d;
+ cdeg = ddeg;
+
+ if (!divide(r, pow(ri, delta), d, false))
+ throw(std::runtime_error("invalid expression in red_gcd(), division failed"));
+ ddeg = d.degree(*x);
+ if (ddeg == 0) {
+ if (is_ex_exactly_of_type(r, numeric))
+ return gamma;
+ else
+ return gamma * r.primpart(*x);
+ }
+
+ ri = c.expand().lcoeff(*x);
+ delta = cdeg - ddeg;
+ }
}
sr_gcd_called++;
#endif
- // The first symbol is our main variable
- const symbol &x = *(var->sym);
-
- // Sort c and d so that c has higher degree
- ex c, d;
- int adeg = a.degree(x), bdeg = b.degree(x);
- int cdeg, ddeg;
- if (adeg >= bdeg) {
- c = a;
- d = b;
- cdeg = adeg;
- ddeg = bdeg;
- } else {
- c = b;
- d = a;
- cdeg = bdeg;
- ddeg = adeg;
- }
-
- // Remove content from c and d, to be attached to GCD later
- ex cont_c = c.content(x);
- ex cont_d = d.content(x);
- ex gamma = gcd(cont_c, cont_d, NULL, NULL, false);
- if (ddeg == 0)
- return gamma;
- c = c.primpart(x, cont_c);
- d = d.primpart(x, cont_d);
+ // The first symbol is our main variable
+ const symbol &x = *(var->sym);
+
+ // Sort c and d so that c has higher degree
+ ex c, d;
+ int adeg = a.degree(x), bdeg = b.degree(x);
+ int cdeg, ddeg;
+ if (adeg >= bdeg) {
+ c = a;
+ d = b;
+ cdeg = adeg;
+ ddeg = bdeg;
+ } else {
+ c = b;
+ d = a;
+ cdeg = bdeg;
+ ddeg = adeg;
+ }
+
+ // Remove content from c and d, to be attached to GCD later
+ ex cont_c = c.content(x);
+ ex cont_d = d.content(x);
+ ex gamma = gcd(cont_c, cont_d, NULL, NULL, false);
+ if (ddeg == 0)
+ return gamma;
+ c = c.primpart(x, cont_c);
+ d = d.primpart(x, cont_d);
//std::clog << " content " << gamma << " removed, continuing with sr_gcd(" << c << "," << d << ")\n";
- // First element of subresultant sequence
- ex r = _ex0(), ri = _ex1(), psi = _ex1();
- int delta = cdeg - ddeg;
+ // First element of subresultant sequence
+ ex r = _ex0(), ri = _ex1(), psi = _ex1();
+ int delta = cdeg - ddeg;
- for (;;) {
- // Calculate polynomial pseudo-remainder
+ for (;;) {
+ // Calculate polynomial pseudo-remainder
//std::clog << " start of loop, psi = " << psi << ", calculating pseudo-remainder...\n";
//std::clog << " d = " << d << endl;
- r = prem(c, d, x, false);
- if (r.is_zero())
- return gamma * d.primpart(x);
- c = d;
- cdeg = ddeg;
+ r = prem(c, d, x, false);
+ if (r.is_zero())
+ return gamma * d.primpart(x);
+ c = d;
+ cdeg = ddeg;
//std::clog << " dividing...\n";
- if (!divide_in_z(r, ri * pow(psi, delta), d, var))
- throw(std::runtime_error("invalid expression in sr_gcd(), division failed"));
- ddeg = d.degree(x);
- if (ddeg == 0) {
- if (is_ex_exactly_of_type(r, numeric))
- return gamma;
- else
- return gamma * r.primpart(x);
- }
-
- // Next element of subresultant sequence
+ if (!divide_in_z(r, ri * pow(psi, delta), d, var))
+ throw(std::runtime_error("invalid expression in sr_gcd(), division failed"));
+ ddeg = d.degree(x);
+ if (ddeg == 0) {
+ if (is_ex_exactly_of_type(r, numeric))
+ return gamma;
+ else
+ return gamma * r.primpart(x);
+ }
+
+ // Next element of subresultant sequence
//std::clog << " calculating next subresultant...\n";
- ri = c.expand().lcoeff(x);
- if (delta == 1)
- psi = ri;
- else if (delta)
- divide_in_z(pow(ri, delta), pow(psi, delta-1), psi, var+1);
- delta = cdeg - ddeg;
- }
+ ri = c.expand().lcoeff(x);
+ if (delta == 1)
+ psi = ri;
+ else if (delta)
+ divide_in_z(pow(ri, delta), pow(psi, delta-1), psi, var+1);
+ delta = cdeg - ddeg;
+ }
}
* @see heur_gcd */
numeric ex::max_coefficient(void) const
{
- GINAC_ASSERT(bp!=0);
- return bp->max_coefficient();
+ GINAC_ASSERT(bp!=0);
+ return bp->max_coefficient();
}
numeric basic::max_coefficient(void) const
{
- return _num1();
+ return _num1();
}
numeric numeric::max_coefficient(void) const
{
- return abs(*this);
+ return abs(*this);
}
numeric add::max_coefficient(void) const
{
- epvector::const_iterator it = seq.begin();
- epvector::const_iterator itend = seq.end();
- GINAC_ASSERT(is_ex_exactly_of_type(overall_coeff,numeric));
- numeric cur_max = abs(ex_to_numeric(overall_coeff));
- while (it != itend) {
- numeric a;
- GINAC_ASSERT(!is_ex_exactly_of_type(it->rest,numeric));
- a = abs(ex_to_numeric(it->coeff));
- if (a > cur_max)
- cur_max = a;
- it++;
- }
- return cur_max;
+ epvector::const_iterator it = seq.begin();
+ epvector::const_iterator itend = seq.end();
+ GINAC_ASSERT(is_ex_exactly_of_type(overall_coeff,numeric));
+ numeric cur_max = abs(ex_to_numeric(overall_coeff));
+ while (it != itend) {
+ numeric a;
+ GINAC_ASSERT(!is_ex_exactly_of_type(it->rest,numeric));
+ a = abs(ex_to_numeric(it->coeff));
+ if (a > cur_max)
+ cur_max = a;
+ it++;
+ }
+ return cur_max;
}
numeric mul::max_coefficient(void) const
{
#ifdef DO_GINAC_ASSERT
- epvector::const_iterator it = seq.begin();
- epvector::const_iterator itend = seq.end();
- while (it != itend) {
- GINAC_ASSERT(!is_ex_exactly_of_type(recombine_pair_to_ex(*it),numeric));
- it++;
- }
+ epvector::const_iterator it = seq.begin();
+ epvector::const_iterator itend = seq.end();
+ while (it != itend) {
+ GINAC_ASSERT(!is_ex_exactly_of_type(recombine_pair_to_ex(*it),numeric));
+ it++;
+ }
#endif // def DO_GINAC_ASSERT
- GINAC_ASSERT(is_ex_exactly_of_type(overall_coeff,numeric));
- return abs(ex_to_numeric(overall_coeff));
+ GINAC_ASSERT(is_ex_exactly_of_type(overall_coeff,numeric));
+ return abs(ex_to_numeric(overall_coeff));
}
* @see heur_gcd */
ex ex::smod(const numeric &xi) const
{
- GINAC_ASSERT(bp!=0);
- return bp->smod(xi);
+ GINAC_ASSERT(bp!=0);
+ return bp->smod(xi);
}
ex basic::smod(const numeric &xi) const
{
- return *this;
+ return *this;
}
ex numeric::smod(const numeric &xi) const
{
#ifndef NO_NAMESPACE_GINAC
- return GiNaC::smod(*this, xi);
+ return GiNaC::smod(*this, xi);
#else // ndef NO_NAMESPACE_GINAC
- return ::smod(*this, xi);
+ return ::smod(*this, xi);
#endif // ndef NO_NAMESPACE_GINAC
}
ex add::smod(const numeric &xi) const
{
- epvector newseq;
- newseq.reserve(seq.size()+1);
- epvector::const_iterator it = seq.begin();
- epvector::const_iterator itend = seq.end();
- while (it != itend) {
- GINAC_ASSERT(!is_ex_exactly_of_type(it->rest,numeric));
+ epvector newseq;
+ newseq.reserve(seq.size()+1);
+ epvector::const_iterator it = seq.begin();
+ epvector::const_iterator itend = seq.end();
+ while (it != itend) {
+ GINAC_ASSERT(!is_ex_exactly_of_type(it->rest,numeric));
#ifndef NO_NAMESPACE_GINAC
- numeric coeff = GiNaC::smod(ex_to_numeric(it->coeff), xi);
+ numeric coeff = GiNaC::smod(ex_to_numeric(it->coeff), xi);
#else // ndef NO_NAMESPACE_GINAC
- numeric coeff = ::smod(ex_to_numeric(it->coeff), xi);
+ numeric coeff = ::smod(ex_to_numeric(it->coeff), xi);
#endif // ndef NO_NAMESPACE_GINAC
- if (!coeff.is_zero())
- newseq.push_back(expair(it->rest, coeff));
- it++;
- }
- GINAC_ASSERT(is_ex_exactly_of_type(overall_coeff,numeric));
+ if (!coeff.is_zero())
+ newseq.push_back(expair(it->rest, coeff));
+ it++;
+ }
+ GINAC_ASSERT(is_ex_exactly_of_type(overall_coeff,numeric));
#ifndef NO_NAMESPACE_GINAC
- numeric coeff = GiNaC::smod(ex_to_numeric(overall_coeff), xi);
+ numeric coeff = GiNaC::smod(ex_to_numeric(overall_coeff), xi);
#else // ndef NO_NAMESPACE_GINAC
- numeric coeff = ::smod(ex_to_numeric(overall_coeff), xi);
+ numeric coeff = ::smod(ex_to_numeric(overall_coeff), xi);
#endif // ndef NO_NAMESPACE_GINAC
- return (new add(newseq,coeff))->setflag(status_flags::dynallocated);
+ return (new add(newseq,coeff))->setflag(status_flags::dynallocated);
}
ex mul::smod(const numeric &xi) const
{
#ifdef DO_GINAC_ASSERT
- epvector::const_iterator it = seq.begin();
- epvector::const_iterator itend = seq.end();
- while (it != itend) {
- GINAC_ASSERT(!is_ex_exactly_of_type(recombine_pair_to_ex(*it),numeric));
- it++;
- }
+ epvector::const_iterator it = seq.begin();
+ epvector::const_iterator itend = seq.end();
+ while (it != itend) {
+ GINAC_ASSERT(!is_ex_exactly_of_type(recombine_pair_to_ex(*it),numeric));
+ it++;
+ }
#endif // def DO_GINAC_ASSERT
- mul * mulcopyp=new mul(*this);
- GINAC_ASSERT(is_ex_exactly_of_type(overall_coeff,numeric));
+ mul * mulcopyp=new mul(*this);
+ GINAC_ASSERT(is_ex_exactly_of_type(overall_coeff,numeric));
#ifndef NO_NAMESPACE_GINAC
- mulcopyp->overall_coeff = GiNaC::smod(ex_to_numeric(overall_coeff),xi);
+ mulcopyp->overall_coeff = GiNaC::smod(ex_to_numeric(overall_coeff),xi);
#else // ndef NO_NAMESPACE_GINAC
- mulcopyp->overall_coeff = ::smod(ex_to_numeric(overall_coeff),xi);
+ mulcopyp->overall_coeff = ::smod(ex_to_numeric(overall_coeff),xi);
#endif // ndef NO_NAMESPACE_GINAC
- mulcopyp->clearflag(status_flags::evaluated);
- mulcopyp->clearflag(status_flags::hash_calculated);
- return mulcopyp->setflag(status_flags::dynallocated);
+ mulcopyp->clearflag(status_flags::evaluated);
+ mulcopyp->clearflag(status_flags::hash_calculated);
+ return mulcopyp->setflag(status_flags::dynallocated);
}
heur_gcd_called++;
#endif
+ // Algorithms only works for non-vanishing input polynomials
+ if (a.is_zero() || b.is_zero())
+ return *new ex(fail());
+
// GCD of two numeric values -> CLN
- if (is_ex_exactly_of_type(a, numeric) && is_ex_exactly_of_type(b, numeric)) {
- numeric g = gcd(ex_to_numeric(a), ex_to_numeric(b));
- numeric rg;
- if (ca || cb)
- rg = g.inverse();
- if (ca)
- *ca = ex_to_numeric(a).mul(rg);
- if (cb)
- *cb = ex_to_numeric(b).mul(rg);
- return g;
- }
-
- // The first symbol is our main variable
- const symbol &x = *(var->sym);
-
- // Remove integer content
- numeric gc = gcd(a.integer_content(), b.integer_content());
- numeric rgc = gc.inverse();
- ex p = a * rgc;
- ex q = b * rgc;
- int maxdeg = max(p.degree(x), q.degree(x));
-
- // Find evaluation point
- numeric mp = p.max_coefficient(), mq = q.max_coefficient();
- numeric xi;
- if (mp > mq)
- xi = mq * _num2() + _num2();
- else
- xi = mp * _num2() + _num2();
-
- // 6 tries maximum
- for (int t=0; t<6; t++) {
- if (xi.int_length() * maxdeg > 100000) {
+ if (is_ex_exactly_of_type(a, numeric) && is_ex_exactly_of_type(b, numeric)) {
+ numeric g = gcd(ex_to_numeric(a), ex_to_numeric(b));
+ if (ca)
+ *ca = ex_to_numeric(a) / g;
+ if (cb)
+ *cb = ex_to_numeric(b) / g;
+ return g;
+ }
+
+ // The first symbol is our main variable
+ const symbol &x = *(var->sym);
+
+ // Remove integer content
+ numeric gc = gcd(a.integer_content(), b.integer_content());
+ numeric rgc = gc.inverse();
+ ex p = a * rgc;
+ ex q = b * rgc;
+ int maxdeg = std::max(p.degree(x),q.degree(x));
+
+ // Find evaluation point
+ numeric mp = p.max_coefficient();
+ numeric mq = q.max_coefficient();
+ numeric xi;
+ if (mp > mq)
+ xi = mq * _num2() + _num2();
+ else
+ xi = mp * _num2() + _num2();
+
+ // 6 tries maximum
+ for (int t=0; t<6; t++) {
+ if (xi.int_length() * maxdeg > 100000) {
//std::clog << "giving up heur_gcd, xi.int_length = " << xi.int_length() << ", maxdeg = " << maxdeg << endl;
- throw gcdheu_failed();
+ throw gcdheu_failed();
}
- // Apply evaluation homomorphism and calculate GCD
+ // Apply evaluation homomorphism and calculate GCD
ex cp, cq;
- ex gamma = heur_gcd(p.subs(x == xi), q.subs(x == xi), &cp, &cq, var+1).expand();
- if (!is_ex_exactly_of_type(gamma, fail)) {
+ ex gamma = heur_gcd(p.subs(x == xi), q.subs(x == xi), &cp, &cq, var+1).expand();
+ if (!is_ex_exactly_of_type(gamma, fail)) {
- // Reconstruct polynomial from GCD of mapped polynomials
+ // Reconstruct polynomial from GCD of mapped polynomials
ex g = interpolate(gamma, xi, x);
- // Remove integer content
- g /= g.integer_content();
-
- // If the calculated polynomial divides both p and q, this is the GCD
- ex dummy;
- if (divide_in_z(p, g, ca ? *ca : dummy, var) && divide_in_z(q, g, cb ? *cb : dummy, var)) {
- g *= gc;
- ex lc = g.lcoeff(x);
- if (is_ex_exactly_of_type(lc, numeric) && ex_to_numeric(lc).is_negative())
- return -g;
- else
- return g;
- }
+ // Remove integer content
+ g /= g.integer_content();
+
+ // If the calculated polynomial divides both p and q, this is the GCD
+ ex dummy;
+ if (divide_in_z(p, g, ca ? *ca : dummy, var) && divide_in_z(q, g, cb ? *cb : dummy, var)) {
+ g *= gc;
+ ex lc = g.lcoeff(x);
+ if (is_ex_exactly_of_type(lc, numeric) && ex_to_numeric(lc).is_negative())
+ return -g;
+ else
+ return g;
+ }
#if 0
cp = interpolate(cp, xi, x);
if (divide_in_z(cp, p, g, var)) {
g *= gc;
if (ca)
*ca = cp;
- ex lc = g.lcoeff(x);
- if (is_ex_exactly_of_type(lc, numeric) && ex_to_numeric(lc).is_negative())
- return -g;
- else
- return g;
+ ex lc = g.lcoeff(x);
+ if (is_ex_exactly_of_type(lc, numeric) && ex_to_numeric(lc).is_negative())
+ return -g;
+ else
+ return g;
}
}
cq = interpolate(cq, xi, x);
g *= gc;
if (cb)
*cb = cq;
- ex lc = g.lcoeff(x);
- if (is_ex_exactly_of_type(lc, numeric) && ex_to_numeric(lc).is_negative())
- return -g;
- else
- return g;
+ ex lc = g.lcoeff(x);
+ if (is_ex_exactly_of_type(lc, numeric) && ex_to_numeric(lc).is_negative())
+ return -g;
+ else
+ return g;
}
}
#endif
- }
+ }
- // Next evaluation point
- xi = iquo(xi * isqrt(isqrt(xi)) * numeric(73794), numeric(27011));
- }
- return *new ex(fail());
+ // Next evaluation point
+ xi = iquo(xi * isqrt(isqrt(xi)) * numeric(73794), numeric(27011));
+ }
+ return *new ex(fail());
}
#endif
// GCD of numerics -> CLN
- if (is_ex_exactly_of_type(a, numeric) && is_ex_exactly_of_type(b, numeric)) {
- numeric g = gcd(ex_to_numeric(a), ex_to_numeric(b));
- if (ca)
- *ca = ex_to_numeric(a) / g;
- if (cb)
- *cb = ex_to_numeric(b) / g;
- return g;
- }
+ if (is_ex_exactly_of_type(a, numeric) && is_ex_exactly_of_type(b, numeric)) {
+ numeric g = gcd(ex_to_numeric(a), ex_to_numeric(b));
+ if (ca || cb) {
+ if (g.is_zero()) {
+ if (ca)
+ *ca = _ex0();
+ if (cb)
+ *cb = _ex0();
+ } else {
+ if (ca)
+ *ca = ex_to_numeric(a) / g;
+ if (cb)
+ *cb = ex_to_numeric(b) / g;
+ }
+ }
+ return g;
+ }
// Check arguments
- if (check_args && !a.info(info_flags::rational_polynomial) || !b.info(info_flags::rational_polynomial)) {
- throw(std::invalid_argument("gcd: arguments must be polynomials over the rationals"));
- }
+ if (check_args && !a.info(info_flags::rational_polynomial) || !b.info(info_flags::rational_polynomial)) {
+ throw(std::invalid_argument("gcd: arguments must be polynomials over the rationals"));
+ }
// Partially factored cases (to avoid expanding large expressions)
if (is_ex_exactly_of_type(a, mul)) {
}
#endif
- // Some trivial cases
+ // Some trivial cases
ex aex = a.expand(), bex = b.expand();
- if (aex.is_zero()) {
- if (ca)
- *ca = _ex0();
- if (cb)
- *cb = _ex1();
- return b;
- }
- if (bex.is_zero()) {
- if (ca)
- *ca = _ex1();
- if (cb)
- *cb = _ex0();
- return a;
- }
- if (aex.is_equal(_ex1()) || bex.is_equal(_ex1())) {
- if (ca)
- *ca = a;
- if (cb)
- *cb = b;
- return _ex1();
- }
+ if (aex.is_zero()) {
+ if (ca)
+ *ca = _ex0();
+ if (cb)
+ *cb = _ex1();
+ return b;
+ }
+ if (bex.is_zero()) {
+ if (ca)
+ *ca = _ex1();
+ if (cb)
+ *cb = _ex0();
+ return a;
+ }
+ if (aex.is_equal(_ex1()) || bex.is_equal(_ex1())) {
+ if (ca)
+ *ca = a;
+ if (cb)
+ *cb = b;
+ return _ex1();
+ }
#if FAST_COMPARE
- if (a.is_equal(b)) {
- if (ca)
- *ca = _ex1();
- if (cb)
- *cb = _ex1();
- return a;
- }
+ if (a.is_equal(b)) {
+ if (ca)
+ *ca = _ex1();
+ if (cb)
+ *cb = _ex1();
+ return a;
+ }
#endif
- // Gather symbol statistics
- sym_desc_vec sym_stats;
- get_symbol_stats(a, b, sym_stats);
+ // Gather symbol statistics
+ sym_desc_vec sym_stats;
+ get_symbol_stats(a, b, sym_stats);
- // The symbol with least degree is our main variable
- sym_desc_vec::const_iterator var = sym_stats.begin();
- const symbol &x = *(var->sym);
+ // The symbol with least degree is our main variable
+ sym_desc_vec::const_iterator var = sym_stats.begin();
+ const symbol &x = *(var->sym);
- // Cancel trivial common factor
- int ldeg_a = var->ldeg_a;
- int ldeg_b = var->ldeg_b;
- int min_ldeg = min(ldeg_a, ldeg_b);
- if (min_ldeg > 0) {
- ex common = power(x, min_ldeg);
+ // Cancel trivial common factor
+ int ldeg_a = var->ldeg_a;
+ int ldeg_b = var->ldeg_b;
+ int min_ldeg = std::min(ldeg_a,ldeg_b);
+ if (min_ldeg > 0) {
+ ex common = power(x, min_ldeg);
//std::clog << "trivial common factor " << common << endl;
- return gcd((aex / common).expand(), (bex / common).expand(), ca, cb, false) * common;
- }
+ return gcd((aex / common).expand(), (bex / common).expand(), ca, cb, false) * common;
+ }
- // Try to eliminate variables
- if (var->deg_a == 0) {
+ // Try to eliminate variables
+ if (var->deg_a == 0) {
//std::clog << "eliminating variable " << x << " from b" << endl;
- ex c = bex.content(x);
- ex g = gcd(aex, c, ca, cb, false);
- if (cb)
- *cb *= bex.unit(x) * bex.primpart(x, c);
- return g;
- } else if (var->deg_b == 0) {
+ ex c = bex.content(x);
+ ex g = gcd(aex, c, ca, cb, false);
+ if (cb)
+ *cb *= bex.unit(x) * bex.primpart(x, c);
+ return g;
+ } else if (var->deg_b == 0) {
//std::clog << "eliminating variable " << x << " from a" << endl;
- ex c = aex.content(x);
- ex g = gcd(c, bex, ca, cb, false);
- if (ca)
- *ca *= aex.unit(x) * aex.primpart(x, c);
- return g;
- }
-
- ex g;
+ ex c = aex.content(x);
+ ex g = gcd(c, bex, ca, cb, false);
+ if (ca)
+ *ca *= aex.unit(x) * aex.primpart(x, c);
+ return g;
+ }
+
+ ex g;
#if 1
- // Try heuristic algorithm first, fall back to PRS if that failed
- try {
- g = heur_gcd(aex, bex, ca, cb, var);
- } catch (gcdheu_failed) {
- g = *new ex(fail());
- }
- if (is_ex_exactly_of_type(g, fail)) {
+ // Try heuristic algorithm first, fall back to PRS if that failed
+ try {
+ g = heur_gcd(aex, bex, ca, cb, var);
+ } catch (gcdheu_failed) {
+ g = *new ex(fail());
+ }
+ if (is_ex_exactly_of_type(g, fail)) {
//std::clog << "heuristics failed" << endl;
#if STATISTICS
heur_gcd_failed++;
if (cb)
*cb = b;
} else {
- if (ca)
- divide(aex, g, *ca, false);
- if (cb)
- divide(bex, g, *cb, false);
+ if (ca)
+ divide(aex, g, *ca, false);
+ if (cb)
+ divide(bex, g, *cb, false);
}
#if 1
- } else {
+ } else {
if (g.is_equal(_ex1())) {
// Keep cofactors factored if possible
if (ca)
}
}
#endif
- return g;
+ return g;
}
* @return the LCM as a new expression */
ex lcm(const ex &a, const ex &b, bool check_args)
{
- if (is_ex_exactly_of_type(a, numeric) && is_ex_exactly_of_type(b, numeric))
- return lcm(ex_to_numeric(a), ex_to_numeric(b));
- if (check_args && !a.info(info_flags::rational_polynomial) || !b.info(info_flags::rational_polynomial))
- throw(std::invalid_argument("lcm: arguments must be polynomials over the rationals"));
-
- ex ca, cb;
- ex g = gcd(a, b, &ca, &cb, false);
- return ca * cb * g;
+ if (is_ex_exactly_of_type(a, numeric) && is_ex_exactly_of_type(b, numeric))
+ return lcm(ex_to_numeric(a), ex_to_numeric(b));
+ if (check_args && !a.info(info_flags::rational_polynomial) || !b.info(info_flags::rational_polynomial))
+ throw(std::invalid_argument("lcm: arguments must be polynomials over the rationals"));
+
+ ex ca, cb;
+ ex g = gcd(a, b, &ca, &cb, false);
+ return ca * cb * g;
}
// a and b can be multivariate polynomials but they are treated as univariate polynomials in x.
static ex univariate_gcd(const ex &a, const ex &b, const symbol &x)
{
- if (a.is_zero())
- return b;
- if (b.is_zero())
- return a;
- if (a.is_equal(_ex1()) || b.is_equal(_ex1()))
- return _ex1();
- if (is_ex_of_type(a, numeric) && is_ex_of_type(b, numeric))
- return gcd(ex_to_numeric(a), ex_to_numeric(b));
- if (!a.info(info_flags::rational_polynomial) || !b.info(info_flags::rational_polynomial))
- throw(std::invalid_argument("univariate_gcd: arguments must be polynomials over the rationals"));
-
- // Euclidean algorithm
- ex c, d, r;
- if (a.degree(x) >= b.degree(x)) {
- c = a;
- d = b;
- } else {
- c = b;
- d = a;
- }
- for (;;) {
- r = rem(c, d, x, false);
- if (r.is_zero())
- break;
- c = d;
- d = r;
- }
- return d / d.lcoeff(x);
+ if (a.is_zero())
+ return b;
+ if (b.is_zero())
+ return a;
+ if (a.is_equal(_ex1()) || b.is_equal(_ex1()))
+ return _ex1();
+ if (is_ex_of_type(a, numeric) && is_ex_of_type(b, numeric))
+ return gcd(ex_to_numeric(a), ex_to_numeric(b));
+ if (!a.info(info_flags::rational_polynomial) || !b.info(info_flags::rational_polynomial))
+ throw(std::invalid_argument("univariate_gcd: arguments must be polynomials over the rationals"));
+
+ // Euclidean algorithm
+ ex c, d, r;
+ if (a.degree(x) >= b.degree(x)) {
+ c = a;
+ d = b;
+ } else {
+ c = b;
+ d = a;
+ }
+ for (;;) {
+ r = rem(c, d, x, false);
+ if (r.is_zero())
+ break;
+ c = d;
+ d = r;
+ }
+ return d / d.lcoeff(x);
}
* @return factored polynomial */
ex sqrfree(const ex &a, const symbol &x)
{
- int i = 1;
- ex res = _ex1();
- ex b = a.diff(x);
- ex c = univariate_gcd(a, b, x);
- ex w;
- if (c.is_equal(_ex1())) {
- w = a;
- } else {
- w = quo(a, c, x);
- ex y = quo(b, c, x);
- ex z = y - w.diff(x);
- while (!z.is_zero()) {
- ex g = univariate_gcd(w, z, x);
- res *= power(g, i);
- w = quo(w, g, x);
- y = quo(z, g, x);
- z = y - w.diff(x);
- i++;
- }
- }
- return res * power(w, i);
+ int i = 1;
+ ex res = _ex1();
+ ex b = a.diff(x);
+ ex c = univariate_gcd(a, b, x);
+ ex w;
+ if (c.is_equal(_ex1())) {
+ w = a;
+ } else {
+ w = quo(a, c, x);
+ ex y = quo(b, c, x);
+ ex z = y - w.diff(x);
+ while (!z.is_zero()) {
+ ex g = univariate_gcd(w, z, x);
+ res *= power(g, i);
+ w = quo(w, g, x);
+ y = quo(z, g, x);
+ z = y - w.diff(x);
+ i++;
+ }
+ }
+ return res * power(w, i);
}
* @see ex::normal */
static ex replace_with_symbol(const ex &e, lst &sym_lst, lst &repl_lst)
{
- // Expression already in repl_lst? Then return the assigned symbol
- for (unsigned i=0; i<repl_lst.nops(); i++)
- if (repl_lst.op(i).is_equal(e))
- return sym_lst.op(i);
-
- // Otherwise create new symbol and add to list, taking care that the
+ // Expression already in repl_lst? Then return the assigned symbol
+ for (unsigned i=0; i<repl_lst.nops(); i++)
+ if (repl_lst.op(i).is_equal(e))
+ return sym_lst.op(i);
+
+ // Otherwise create new symbol and add to list, taking care that the
// replacement expression doesn't contain symbols from the sym_lst
// because subs() is not recursive
symbol s;
ex es(s);
ex e_replaced = e.subs(sym_lst, repl_lst);
- sym_lst.append(es);
- repl_lst.append(e_replaced);
- return es;
+ sym_lst.append(es);
+ repl_lst.append(e_replaced);
+ return es;
}
/** Create a symbol for replacing the expression "e" (or return a previously
* @see ex::to_rational */
static ex replace_with_symbol(const ex &e, lst &repl_lst)
{
- // Expression already in repl_lst? Then return the assigned symbol
- for (unsigned i=0; i<repl_lst.nops(); i++)
- if (repl_lst.op(i).op(1).is_equal(e))
- return repl_lst.op(i).op(0);
-
- // Otherwise create new symbol and add to list, taking care that the
+ // Expression already in repl_lst? Then return the assigned symbol
+ for (unsigned i=0; i<repl_lst.nops(); i++)
+ if (repl_lst.op(i).op(1).is_equal(e))
+ return repl_lst.op(i).op(0);
+
+ // Otherwise create new symbol and add to list, taking care that the
// replacement expression doesn't contain symbols from the sym_lst
// because subs() is not recursive
symbol s;
ex es(s);
ex e_replaced = e.subs(repl_lst);
- repl_lst.append(es == e_replaced);
- return es;
+ repl_lst.append(es == e_replaced);
+ return es;
}
/** Default implementation of ex::normal(). It replaces the object with a
* @see ex::normal */
ex basic::normal(lst &sym_lst, lst &repl_lst, int level) const
{
- return (new lst(replace_with_symbol(*this, sym_lst, repl_lst), _ex1()))->setflag(status_flags::dynallocated);
+ return (new lst(replace_with_symbol(*this, sym_lst, repl_lst), _ex1()))->setflag(status_flags::dynallocated);
}
* @see ex::normal */
ex symbol::normal(lst &sym_lst, lst &repl_lst, int level) const
{
- return (new lst(*this, _ex1()))->setflag(status_flags::dynallocated);
+ return (new lst(*this, _ex1()))->setflag(status_flags::dynallocated);
}
numeric num = numer();
ex numex = num;
- if (num.is_real()) {
- if (!num.is_integer())
- numex = replace_with_symbol(numex, sym_lst, repl_lst);
- } else { // complex
- numeric re = num.real(), im = num.imag();
- ex re_ex = re.is_rational() ? re : replace_with_symbol(re, sym_lst, repl_lst);
- ex im_ex = im.is_rational() ? im : replace_with_symbol(im, sym_lst, repl_lst);
- numex = re_ex + im_ex * replace_with_symbol(I, sym_lst, repl_lst);
- }
+ if (num.is_real()) {
+ if (!num.is_integer())
+ numex = replace_with_symbol(numex, sym_lst, repl_lst);
+ } else { // complex
+ numeric re = num.real(), im = num.imag();
+ ex re_ex = re.is_rational() ? re : replace_with_symbol(re, sym_lst, repl_lst);
+ ex im_ex = im.is_rational() ? im : replace_with_symbol(im, sym_lst, repl_lst);
+ numex = re_ex + im_ex * replace_with_symbol(I, sym_lst, repl_lst);
+ }
// Denominator is always a real integer (see numeric::denom())
return (new lst(numex, denom()))->setflag(status_flags::dynallocated);
* @return cancelled fraction {n, d} as a list */
static ex frac_cancel(const ex &n, const ex &d)
{
- ex num = n;
- ex den = d;
- numeric pre_factor = _num1();
+ ex num = n;
+ ex den = d;
+ numeric pre_factor = _num1();
//std::clog << "frac_cancel num = " << num << ", den = " << den << endl;
- // Handle special cases where numerator or denominator is 0
- if (num.is_zero())
+ // Handle special cases where numerator or denominator is 0
+ if (num.is_zero())
return (new lst(_ex0(), _ex1()))->setflag(status_flags::dynallocated);
- if (den.expand().is_zero())
- throw(std::overflow_error("frac_cancel: division by zero in frac_cancel"));
+ if (den.expand().is_zero())
+ throw(std::overflow_error("frac_cancel: division by zero in frac_cancel"));
- // Bring numerator and denominator to Z[X] by multiplying with
- // LCM of all coefficients' denominators
- numeric num_lcm = lcm_of_coefficients_denominators(num);
- numeric den_lcm = lcm_of_coefficients_denominators(den);
+ // Bring numerator and denominator to Z[X] by multiplying with
+ // LCM of all coefficients' denominators
+ numeric num_lcm = lcm_of_coefficients_denominators(num);
+ numeric den_lcm = lcm_of_coefficients_denominators(den);
num = multiply_lcm(num, num_lcm);
den = multiply_lcm(den, den_lcm);
- pre_factor = den_lcm / num_lcm;
+ pre_factor = den_lcm / num_lcm;
- // Cancel GCD from numerator and denominator
- ex cnum, cden;
- if (gcd(num, den, &cnum, &cden, false) != _ex1()) {
+ // Cancel GCD from numerator and denominator
+ ex cnum, cden;
+ if (gcd(num, den, &cnum, &cden, false) != _ex1()) {
num = cnum;
den = cden;
}
// as defined by get_first_symbol() is made positive)
const symbol *x;
if (get_first_symbol(den, x)) {
- GINAC_ASSERT(is_ex_exactly_of_type(den.unit(*x),numeric));
+ GINAC_ASSERT(is_ex_exactly_of_type(den.unit(*x),numeric));
if (ex_to_numeric(den.unit(*x)).is_negative()) {
num *= _ex_1();
den *= _ex_1();
// Return result as list
//std::clog << " returns num = " << num << ", den = " << den << ", pre_factor = " << pre_factor << endl;
- return (new lst(num * pre_factor.numer(), den * pre_factor.denom()))->setflag(status_flags::dynallocated);
+ return (new lst(num * pre_factor.numer(), den * pre_factor.denom()))->setflag(status_flags::dynallocated);
}
ex add::normal(lst &sym_lst, lst &repl_lst, int level) const
{
if (level == 1)
- return (new lst(*this, _ex1()))->setflag(status_flags::dynallocated);
+ return (new lst(replace_with_symbol(*this, sym_lst, repl_lst), _ex1()))->setflag(status_flags::dynallocated);
else if (level == -max_recursion_level)
- throw(std::runtime_error("max recursion level reached"));
-
- // Normalize and expand children, chop into summands
- exvector o;
- o.reserve(seq.size()+1);
- epvector::const_iterator it = seq.begin(), itend = seq.end();
- while (it != itend) {
+ throw(std::runtime_error("max recursion level reached"));
+
+ // Normalize and expand children, chop into summands and split each
+ // one into numerator and denominator
+ exvector nums, dens;
+ nums.reserve(seq.size()+1);
+ dens.reserve(seq.size()+1);
+ epvector::const_iterator it = seq.begin(), itend = seq.end();
+ while (it != itend) {
// Normalize and expand child
- ex n = recombine_pair_to_ex(*it).bp->normal(sym_lst, repl_lst, level-1).expand();
+ ex n = recombine_pair_to_ex(*it).bp->normal(sym_lst, repl_lst, level-1).expand();
// If numerator is a sum, chop into summands
- if (is_ex_exactly_of_type(n.op(0), add)) {
- epvector::const_iterator bit = ex_to_add(n.op(0)).seq.begin(), bitend = ex_to_add(n.op(0)).seq.end();
- while (bit != bitend) {
- o.push_back((new lst(recombine_pair_to_ex(*bit), n.op(1)))->setflag(status_flags::dynallocated));
- bit++;
- }
+ if (is_ex_exactly_of_type(n.op(0), add)) {
+ epvector::const_iterator bit = ex_to_add(n.op(0)).seq.begin(), bitend = ex_to_add(n.op(0)).seq.end();
+ while (bit != bitend) {
+ nums.push_back(recombine_pair_to_ex(*bit));
+ dens.push_back(n.op(1));
+ bit++;
+ }
// The overall_coeff is already normalized (== rational), we just
// split it into numerator and denominator
GINAC_ASSERT(ex_to_numeric(ex_to_add(n.op(0)).overall_coeff).is_rational());
numeric overall = ex_to_numeric(ex_to_add(n.op(0)).overall_coeff);
- o.push_back((new lst(overall.numer(), overall.denom() * n.op(1)))->setflag(status_flags::dynallocated));
- } else
- o.push_back(n);
- it++;
- }
- o.push_back(overall_coeff.bp->normal(sym_lst, repl_lst, level-1));
-
- // o is now a vector of {numerator, denominator} lists
-
- // Determine common denominator
- ex den = _ex1();
- exvector::const_iterator ait = o.begin(), aitend = o.end();
-//std::clog << "add::normal uses the following summands:\n";
- while (ait != aitend) {
-//std::clog << " num = " << ait->op(0) << ", den = " << ait->op(1) << endl;
- den = lcm(ait->op(1), den, false);
- ait++;
- }
-//std::clog << " common denominator = " << den << endl;
-
- // Add fractions
- if (den.is_equal(_ex1())) {
-
- // Common denominator is 1, simply add all fractions
- exvector num_seq;
- for (ait=o.begin(); ait!=aitend; ait++) {
- num_seq.push_back(ait->op(0) / ait->op(1));
+ nums.push_back(overall.numer());
+ dens.push_back(overall.denom() * n.op(1));
+ } else {
+ nums.push_back(n.op(0));
+ dens.push_back(n.op(1));
}
- return (new lst((new add(num_seq))->setflag(status_flags::dynallocated), den))->setflag(status_flags::dynallocated);
+ it++;
+ }
+ ex n = overall_coeff.bp->normal(sym_lst, repl_lst, level-1);
+ nums.push_back(n.op(0));
+ dens.push_back(n.op(1));
+ GINAC_ASSERT(nums.size() == dens.size());
- } else {
+ // Now, nums is a vector of all numerators and dens is a vector of
+ // all denominators
- // Perform fractional addition
- exvector num_seq;
- for (ait=o.begin(); ait!=aitend; ait++) {
- ex q;
- if (!divide(den, ait->op(1), q, false)) {
- // should not happen
- throw(std::runtime_error("invalid expression in add::normal, division failed"));
- }
- num_seq.push_back((ait->op(0) * q).expand());
- }
- ex num = (new add(num_seq))->setflag(status_flags::dynallocated);
-
- // Cancel common factors from num/den
- return frac_cancel(num, den);
- }
+ // Add fractions sequentially
+ exvector::const_iterator num_it = nums.begin(), num_itend = nums.end();
+ exvector::const_iterator den_it = dens.begin(), den_itend = dens.end();
+//std::clog << "add::normal uses the following summands:\n";
+//std::clog << " num = " << *num_it << ", den = " << *den_it << endl;
+ ex num = *num_it++, den = *den_it++;
+ while (num_it != num_itend) {
+//std::clog << " num = " << *num_it << ", den = " << *den_it << endl;
+ ex co_den1, co_den2;
+ ex g = gcd(den, *den_it, &co_den1, &co_den2, false);
+ num = (num * co_den2) + (*num_it * co_den1);
+ den *= co_den2; // this is the lcm(den, *den_it)
+ num_it++; den_it++;
+ }
+//std::clog << " common denominator = " << den << endl;
+
+ // Cancel common factors from num/den
+ return frac_cancel(num, den);
}
ex mul::normal(lst &sym_lst, lst &repl_lst, int level) const
{
if (level == 1)
- return (new lst(*this, _ex1()))->setflag(status_flags::dynallocated);
+ return (new lst(replace_with_symbol(*this, sym_lst, repl_lst), _ex1()))->setflag(status_flags::dynallocated);
else if (level == -max_recursion_level)
- throw(std::runtime_error("max recursion level reached"));
+ throw(std::runtime_error("max recursion level reached"));
- // Normalize children, separate into numerator and denominator
+ // Normalize children, separate into numerator and denominator
ex num = _ex1();
ex den = _ex1();
ex n;
- epvector::const_iterator it = seq.begin(), itend = seq.end();
- while (it != itend) {
+ epvector::const_iterator it = seq.begin(), itend = seq.end();
+ while (it != itend) {
n = recombine_pair_to_ex(*it).bp->normal(sym_lst, repl_lst, level-1);
num *= n.op(0);
den *= n.op(1);
- it++;
- }
+ it++;
+ }
n = overall_coeff.bp->normal(sym_lst, repl_lst, level-1);
num *= n.op(0);
den *= n.op(1);
// Perform fraction cancellation
- return frac_cancel(num, den);
+ return frac_cancel(num, den);
}
ex power::normal(lst &sym_lst, lst &repl_lst, int level) const
{
if (level == 1)
- return (new lst(*this, _ex1()))->setflag(status_flags::dynallocated);
+ return (new lst(replace_with_symbol(*this, sym_lst, repl_lst), _ex1()))->setflag(status_flags::dynallocated);
else if (level == -max_recursion_level)
- throw(std::runtime_error("max recursion level reached"));
+ throw(std::runtime_error("max recursion level reached"));
// Normalize basis
- ex n = basis.bp->normal(sym_lst, repl_lst, level-1);
+ ex n = basis.bp->normal(sym_lst, repl_lst, level-1);
if (exponent.info(info_flags::integer)) {
- if (exponent.info(info_flags::positive)) {
+ if (exponent.info(info_flags::positive)) {
// (a/b)^n -> {a^n, b^n}
return (new lst(power(n.op(0), exponent), power(n.op(1), exponent)))->setflag(status_flags::dynallocated);
// (a/b)^x -> {sym((a/b)^x, 1}
return (new lst(replace_with_symbol(power(n.op(0) / n.op(1), exponent), sym_lst, repl_lst), _ex1()))->setflag(status_flags::dynallocated);
}
- }
+ }
}
* @see ex::normal */
ex pseries::normal(lst &sym_lst, lst &repl_lst, int level) const
{
- epvector new_seq;
- new_seq.reserve(seq.size());
-
- epvector::const_iterator it = seq.begin(), itend = seq.end();
- while (it != itend) {
- new_seq.push_back(expair(it->rest.normal(), it->coeff));
- it++;
- }
- ex n = pseries(relational(var,point), new_seq);
+ epvector new_seq;
+ new_seq.reserve(seq.size());
+
+ epvector::const_iterator it = seq.begin(), itend = seq.end();
+ while (it != itend) {
+ new_seq.push_back(expair(it->rest.normal(), it->coeff));
+ it++;
+ }
+ ex n = pseries(relational(var,point), new_seq);
return (new lst(replace_with_symbol(n, sym_lst, repl_lst), _ex1()))->setflag(status_flags::dynallocated);
}
* @return normalized expression */
ex ex::normal(int level) const
{
- lst sym_lst, repl_lst;
+ lst sym_lst, repl_lst;
- ex e = bp->normal(sym_lst, repl_lst, level);
+ ex e = bp->normal(sym_lst, repl_lst, level);
GINAC_ASSERT(is_ex_of_type(e, lst));
// Re-insert replaced symbols
- if (sym_lst.nops() > 0)
- e = e.subs(sym_lst, repl_lst);
+ if (sym_lst.nops() > 0)
+ e = e.subs(sym_lst, repl_lst);
// Convert {numerator, denominator} form back to fraction
- return e.op(0) / e.op(1);
+ return e.op(0) / e.op(1);
}
/** Numerator of an expression. If the expression is not of the normal form
* @return numerator */
ex ex::numer(void) const
{
- lst sym_lst, repl_lst;
+ lst sym_lst, repl_lst;
- ex e = bp->normal(sym_lst, repl_lst, 0);
+ ex e = bp->normal(sym_lst, repl_lst, 0);
GINAC_ASSERT(is_ex_of_type(e, lst));
// Re-insert replaced symbols
- if (sym_lst.nops() > 0)
- return e.op(0).subs(sym_lst, repl_lst);
+ if (sym_lst.nops() > 0)
+ return e.op(0).subs(sym_lst, repl_lst);
else
return e.op(0);
}
* @return denominator */
ex ex::denom(void) const
{
- lst sym_lst, repl_lst;
+ lst sym_lst, repl_lst;
- ex e = bp->normal(sym_lst, repl_lst, 0);
+ ex e = bp->normal(sym_lst, repl_lst, 0);
GINAC_ASSERT(is_ex_of_type(e, lst));
// Re-insert replaced symbols
- if (sym_lst.nops() > 0)
- return e.op(1).subs(sym_lst, repl_lst);
+ if (sym_lst.nops() > 0)
+ return e.op(1).subs(sym_lst, repl_lst);
else
return e.op(1);
}
* @see ex::to_rational */
ex symbol::to_rational(lst &repl_lst) const
{
- return *this;
+ return *this;
}
* @see ex::to_rational */
ex numeric::to_rational(lst &repl_lst) const
{
- if (is_real()) {
- if (!is_rational())
- return replace_with_symbol(*this, repl_lst);
- } else { // complex
- numeric re = real();
- numeric im = imag();
- ex re_ex = re.is_rational() ? re : replace_with_symbol(re, repl_lst);
- ex im_ex = im.is_rational() ? im : replace_with_symbol(im, repl_lst);
- return re_ex + im_ex * replace_with_symbol(I, repl_lst);
- }
+ if (is_real()) {
+ if (!is_rational())
+ return replace_with_symbol(*this, repl_lst);
+ } else { // complex
+ numeric re = real();
+ numeric im = imag();
+ ex re_ex = re.is_rational() ? re : replace_with_symbol(re, repl_lst);
+ ex im_ex = im.is_rational() ? im : replace_with_symbol(im, repl_lst);
+ return re_ex + im_ex * replace_with_symbol(I, repl_lst);
+ }
return *this;
}
* @see ex::to_rational */
ex expairseq::to_rational(lst &repl_lst) const
{
- epvector s;
- s.reserve(seq.size());
- for (epvector::const_iterator it=seq.begin(); it!=seq.end(); ++it) {
- s.push_back(split_ex_to_pair(recombine_pair_to_ex(*it).to_rational(repl_lst)));
- // s.push_back(combine_ex_with_coeff_to_pair((*it).rest.to_rational(repl_lst),
- }
- ex oc = overall_coeff.to_rational(repl_lst);
- if (oc.info(info_flags::numeric))
- return thisexpairseq(s, overall_coeff);
- else s.push_back(combine_ex_with_coeff_to_pair(oc,_ex1()));
- return thisexpairseq(s, default_overall_coeff());
+ epvector s;
+ s.reserve(seq.size());
+ for (epvector::const_iterator it=seq.begin(); it!=seq.end(); ++it) {
+ s.push_back(split_ex_to_pair(recombine_pair_to_ex(*it).to_rational(repl_lst)));
+ // s.push_back(combine_ex_with_coeff_to_pair((*it).rest.to_rational(repl_lst),
+ }
+ ex oc = overall_coeff.to_rational(repl_lst);
+ if (oc.info(info_flags::numeric))
+ return thisexpairseq(s, overall_coeff);
+ else s.push_back(combine_ex_with_coeff_to_pair(oc,_ex1()));
+ return thisexpairseq(s, default_overall_coeff());
}
git://www.ginac.de / ginac.git / blobdiff