*/
#include <iostream>
-#include <typeinfo>
#include <stdexcept>
+#ifdef DO_GINAC_ASSERT
+# include <typeinfo>
+#endif
#include "basic.h"
#include "ex.h"
#include "symbol.h"
#include "lst.h"
#include "ncmul.h"
+#include "print.h"
#include "archive.h"
#include "utils.h"
#include "debugmsg.h"
}
/** Unarchive the object. */
-ex basic::unarchive(const archive_node &n, const lst &sym_lst)
-{
- return (new basic(n, sym_lst))->setflag(status_flags::dynallocated);
-}
+DEFAULT_UNARCHIVE(basic)
/** Archive the object. */
void basic::archive(archive_node &n) const
// public
-/** Output to ostream formatted as parsable (as in ginsh) input.
- * Generally, superfluous parenthesis should be avoided as far as possible. */
-void basic::print(std::ostream & os, unsigned upper_precedence) const
+/** Output to stream.
+ * @param c print context object that describes the output formatting
+ * @param level value that is used to identify the precedence or indentation
+ * level for placing parentheses and formatting */
+void basic::print(const print_context & c, unsigned level) const
{
- debugmsg("basic print",LOGLEVEL_PRINT);
- os << "[" << class_name() << " object]";
-}
+ debugmsg("basic print", LOGLEVEL_PRINT);
-/** Output to ostream in ugly raw format, so brave developers can have a look
- * at the underlying structure. */
-void basic::printraw(std::ostream & os) const
-{
- debugmsg("basic printraw",LOGLEVEL_PRINT);
- os << "[" << class_name() << " object]";
-}
+ if (is_of_type(c, print_tree)) {
-/** Output to ostream formatted in tree- (indented-) form, so developers can
- * have a look at the underlying structure. */
-void basic::printtree(std::ostream & os, unsigned indent) const
-{
- debugmsg("basic printtree",LOGLEVEL_PRINT);
- os << std::string(indent,' ') << "type=" << class_name()
- << ", hash=" << hashvalue
- << " (0x" << std::hex << hashvalue << std::dec << ")"
- << ", flags=" << flags
- << ", nops=" << nops() << std::endl;
- for (unsigned i=0; i<nops(); ++i) {
- op(i).printtree(os,indent+delta_indent);
- }
-}
+ c.s << std::string(level, ' ') << class_name()
+ << std::hex << ", hash=0x" << hashvalue << ", flags=0x" << flags << std::dec
+ << ", nops=" << nops()
+ << std::endl;
+ for (unsigned i=0; i<nops(); ++i)
+ op(i).print(c, level + static_cast<const print_tree &>(c).delta_indent);
-/** Output to ostream formatted as C-source.
- *
- * @param os a stream for output
- * @param type variable type (one of the csrc_types)
- * @param upper_precedence operator precedence of caller
- * @see ex::printcsrc */
-void basic::printcsrc(std::ostream & os, unsigned type, unsigned upper_precedence) const
-{
- debugmsg("basic print csrc", LOGLEVEL_PRINT);
+ } else
+ c.s << "[" << class_name() << " object]";
}
/** Little wrapper arount print to be called within a debugger.
* debugger because it might not know what cout is. This method can be
* invoked with no argument and it will simply print to stdout.
*
- * @see basic::print*/
+ * @see basic::print */
void basic::dbgprint(void) const
{
this->print(std::cerr);
* @see basic::printtree */
void basic::dbgprinttree(void) const
{
- this->printtree(std::cerr,0);
+ this->print(print_tree(std::cerr));
}
/** Create a new copy of this on the heap. One can think of this as simulating
return false;
}
-/** Return degree of highest power in symbol s. */
-int basic::degree(const symbol & s) const
+/** Return degree of highest power in object s. */
+int basic::degree(const ex & s) const
{
return 0;
}
-/** Return degree of lowest power in symbol s. */
-int basic::ldegree(const symbol & s) const
+/** Return degree of lowest power in object s. */
+int basic::ldegree(const ex & s) const
{
return 0;
}
-/** Return coefficient of degree n in symbol s. */
-ex basic::coeff(const symbol & s, int n) const
+/** Return coefficient of degree n in object s. */
+ex basic::coeff(const ex & s, int n) const
{
return n==0 ? *this : _ex0();
}
-/** Sort expression in terms of powers of some symbol.
- * @param s symbol to sort in. */
-ex basic::collect(const symbol & s) const
+/** Sort expression in terms of powers of some object(s).
+ * @param s object(s) to sort in
+ * @param distributed recursive or distributed form (only used when s is a list) */
+ex basic::collect(const ex & s, bool distributed) const
{
ex x;
- for (int n=this->ldegree(s); n<=this->degree(s); n++)
- x += this->coeff(s,n)*power(s,n);
+ if (is_ex_of_type(s, lst)) {
+
+ // List of objects specified
+ if (s.nops() == 1)
+ return collect(s.op(0));
+
+ else if (distributed) {
+
+ // Get lower/upper degree of all symbols in list
+ int num = s.nops();
+ struct sym_info {
+ ex sym;
+ int ldeg, deg;
+ int cnt; // current degree, 'counter'
+ ex coeff; // coefficient for degree 'cnt'
+ };
+ sym_info *si = new sym_info[num];
+ ex c = *this;
+ for (int i=0; i<num; i++) {
+ si[i].sym = s.op(i);
+ si[i].ldeg = si[i].cnt = this->ldegree(si[i].sym);
+ si[i].deg = this->degree(si[i].sym);
+ c = si[i].coeff = c.coeff(si[i].sym, si[i].cnt);
+ }
+
+ while (true) {
+
+ // Calculate coeff*x1^c1*...*xn^cn
+ ex y = _ex1();
+ for (int i=0; i<num; i++) {
+ int cnt = si[i].cnt;
+ y *= power(si[i].sym, cnt);
+ }
+ x += y * si[num - 1].coeff;
+
+ // Increment counters
+ int n = num - 1;
+ while (true) {
+ si[n].cnt++;
+ if (si[n].cnt <= si[n].deg) {
+ // Update coefficients
+ ex c;
+ if (n == 0)
+ c = *this;
+ else
+ c = si[n - 1].coeff;
+ for (int i=n; i<num; i++)
+ c = si[i].coeff = c.coeff(si[i].sym, si[i].cnt);
+ break;
+ }
+ if (n == 0)
+ goto done;
+ si[n].cnt = si[n].ldeg;
+ n--;
+ }
+ }
+
+done: delete[] si;
+
+ } else {
+
+ // Recursive form
+ x = *this;
+ for (int n=s.nops()-1; n>=0; n--)
+ x = x.collect(s[n]);
+ }
+
+ } else {
+
+ // Only one object specified
+ for (int n=this->ldegree(s); n<=this->degree(s); ++n)
+ x += this->coeff(s,n)*power(s,n);
+ }
- return x;
+ // correct for lost fractional arguments and return
+ return x + (*this - x).expand();
}
/** Perform automatic non-interruptive symbolic evaluation on expression. */
return i.hold();
}
-/** Try to contract two indexed expressions. If a contraction exists, the
- * function overwrites one or both arguments and returns true. Otherwise it
- * returns false. It is guaranteed that both expressions are of class
- * indexed (or a subclass) and that at least one dummy index has been
- * found.
+/** Add two indexed expressions. They are guaranteed to be of class indexed
+ * (or a subclass) and their indices are compatible. This function is used
+ * internally by simplify_indexed().
*
- * @param self The first indexed expression; it's base object is *this
- * @param other The second indexed expression
- * @return true if the contraction was successful, false otherwise */
-bool basic::contract_with(ex & self, ex & other) const
+ * @param self First indexed expression; it's base object is *this
+ * @param other Second indexed expression
+ * @return sum of self and other
+ * @see ex::simplify_indexed() */
+ex basic::add_indexed(const ex & self, const ex & other) const
+{
+ return self + other;
+}
+
+/** Multiply an indexed expression with a scalar. This function is used
+ * internally by simplify_indexed().
+ *
+ * @param self Indexed expression; it's base object is *this
+ * @param other Numeric value
+ * @return product of self and other
+ * @see ex::simplify_indexed() */
+ex basic::scalar_mul_indexed(const ex & self, const numeric & other) const
+{
+ return self * other;
+}
+
+/** Try to contract two indexed expressions that appear in the same product.
+ * If a contraction exists, the function overwrites one or both of the
+ * expressions and returns true. Otherwise it returns false. It is
+ * guaranteed that both expressions are of class indexed (or a subclass)
+ * and that at least one dummy index has been found. This functions is
+ * used internally by simplify_indexed().
+ *
+ * @param self Pointer to first indexed expression; it's base object is *this
+ * @param other Pointer to second indexed expression
+ * @param v The complete vector of factors
+ * @return true if the contraction was successful, false otherwise
+ * @see ex::simplify_indexed() */
+bool basic::contract_with(exvector::iterator self, exvector::iterator other, exvector & v) const
{
// Do nothing
return false;
}
-/** Substitute a set of symbols by arbitrary expressions. The ex returned
+/** Substitute a set of objects by arbitrary expressions. The ex returned
* will already be evaluated. */
ex basic::subs(const lst & ls, const lst & lr) const
{
+ GINAC_ASSERT(ls.nops() == lr.nops());
+
+ for (unsigned i=0; i<ls.nops(); i++) {
+ if (is_equal(*ls.op(i).bp))
+ return lr.op(i);
+ }
+
return *this;
}
/** Returns order relation between two objects of same type. This needs to be
* implemented by each class. It may never return anything else than 0,
* signalling equality, or +1 and -1 signalling inequality and determining
- * the canonical ordering. */
+ * the canonical ordering. (Perl hackers will wonder why C++ doesn't feature
+ * the spaceship operator <=> for denoting just this.) */
int basic::compare_same_type(const basic & other) const
{
return compare_pointers(this, &other);
// public
-/** Substitute symbols in expression and return the result as a new expression.
- * There are two valid types of replacement arguments: 1) a relational like
- * symbol==ex and 2) a list of relationals lst(symbol1==ex1,symbol2==ex2,...),
- * which is converted to subs(lst(symbol1,symbol2,...),lst(ex1,ex2,...)).
- * In addition, an object of class idx can be used instead of a symbol. */
+/** Substitute objects in an expression (syntactic substitution) and return
+ * the result as a new expression. There are two valid types of
+ * replacement arguments: 1) a relational like object==ex and 2) a list of
+ * relationals lst(object1==ex1,object2==ex2,...), which is converted to
+ * subs(lst(object1,object2,...),lst(ex1,ex2,...)). */
ex basic::subs(const ex & e) const
{
if (e.info(info_flags::relation_equal)) {
lst ls;
lst lr;
for (unsigned i=0; i<e.nops(); i++) {
- if (!e.op(i).info(info_flags::relation_equal)) {
- throw(std::invalid_argument("basic::subs(ex): argument must be a list or equations"));
+ ex r = e.op(i);
+ if (!r.info(info_flags::relation_equal)) {
+ throw(std::invalid_argument("basic::subs(ex): argument must be a list of equations"));
}
- if (!e.op(i).op(0).info(info_flags::symbol)) {
- if (!e.op(i).op(0).info(info_flags::idx)) {
- throw(std::invalid_argument("basic::subs(ex): lhs must be a symbol or an idx"));
- }
- }
- ls.append(e.op(i).op(0));
- lr.append(e.op(i).op(1));
+ ls.append(r.op(0));
+ lr.append(r.op(1));
}
- return subs(ls,lr);
+ return subs(ls, lr);
}
/** Compare objects to establish canonical ordering.
if (typeid_this<typeid_other) {
// std::cout << "hash collision, different types: "
// << *this << " and " << other << std::endl;
-// this->printraw(std::cout);
+// this->print(print_tree(std::cout));
// std::cout << " and ";
-// other.printraw(std::cout);
+// other.print(print_tree(std::cout));
// std::cout << std::endl;
return -1;
}
if (typeid_this>typeid_other) {
// std::cout << "hash collision, different types: "
// << *this << " and " << other << std::endl;
-// this->printraw(std::cout);
+// this->print(print_tree(std::cout));
// std::cout << " and ";
-// other.printraw(std::cout);
+// other.print(print_tree(std::cout));
// std::cout << std::endl;
return 1;
}
GINAC_ASSERT(typeid(*this)==typeid(other));
- int cmpval = compare_same_type(other);
- if ((cmpval!=0) && (hash_this<0x80000000U)) {
+// int cmpval = compare_same_type(other);
+// if ((cmpval!=0) && (hash_this<0x80000000U)) {
// std::cout << "hash collision, same type: "
// << *this << " and " << other << std::endl;
-// this->printraw(std::cout);
+// this->print(print_tree(std::cout));
// std::cout << " and ";
-// other.printraw(std::cout);
+// other.print(print_tree(std::cout));
// std::cout << std::endl;
- }
- return cmpval;
+// }
+// return cmpval;
+
+ return compare_same_type(other);
}
/** Test for equality.
// protected
unsigned basic::precedence = 70;
-unsigned basic::delta_indent = 4;
//////////
// global variables
git://www.ginac.de / ginac.git / blobdiff