* Implementation of GiNaC's indices. */
/*
- * GiNaC Copyright (C) 1999-2001 Johannes Gutenberg University Mainz, Germany
+ * GiNaC Copyright (C) 1999-2003 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
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
+#include <iostream>
+#include <sstream>
#include <stdexcept>
-#include <algorithm>
#include "idx.h"
#include "symbol.h"
#include "lst.h"
+#include "relational.h"
#include "print.h"
#include "archive.h"
#include "utils.h"
-#include "debugmsg.h"
namespace GiNaC {
GINAC_IMPLEMENT_REGISTERED_CLASS(spinidx, varidx)
//////////
-// default constructor, destructor, copy constructor assignment operator and helpers
+// default ctor, dtor, copy ctor, assignment operator and helpers
//////////
-idx::idx() : inherited(TINFO_idx)
-{
- debugmsg("idx default constructor", LOGLEVEL_CONSTRUCT);
-}
+idx::idx() : inherited(TINFO_idx) {}
varidx::varidx() : covariant(false)
{
- debugmsg("varidx default constructor", LOGLEVEL_CONSTRUCT);
tinfo_key = TINFO_varidx;
}
spinidx::spinidx() : dotted(false)
{
- debugmsg("spinidx default constructor", LOGLEVEL_CONSTRUCT);
tinfo_key = TINFO_spinidx;
}
idx::idx(const ex & v, const ex & d) : inherited(TINFO_idx), value(v), dim(d)
{
- debugmsg("idx constructor from ex,ex", LOGLEVEL_CONSTRUCT);
if (is_dim_numeric())
if (!dim.info(info_flags::posint))
throw(std::invalid_argument("dimension of space must be a positive integer"));
varidx::varidx(const ex & v, const ex & d, bool cov) : inherited(v, d), covariant(cov)
{
- debugmsg("varidx constructor from ex,ex,bool", LOGLEVEL_CONSTRUCT);
tinfo_key = TINFO_varidx;
}
spinidx::spinidx(const ex & v, const ex & d, bool cov, bool dot) : inherited(v, d, cov), dotted(dot)
{
- debugmsg("spinidx constructor from ex,ex,bool,bool", LOGLEVEL_CONSTRUCT);
tinfo_key = TINFO_spinidx;
}
idx::idx(const archive_node &n, const lst &sym_lst) : inherited(n, sym_lst)
{
- debugmsg("idx constructor from archive_node", LOGLEVEL_CONSTRUCT);
n.find_ex("value", value, sym_lst);
n.find_ex("dim", dim, sym_lst);
}
varidx::varidx(const archive_node &n, const lst &sym_lst) : inherited(n, sym_lst)
{
- debugmsg("varidx constructor from archive_node", LOGLEVEL_CONSTRUCT);
n.find_bool("covariant", covariant);
}
spinidx::spinidx(const archive_node &n, const lst &sym_lst) : inherited(n, sym_lst)
{
- debugmsg("spinidx constructor from archive_node", LOGLEVEL_CONSTRUCT);
n.find_bool("dotted", dotted);
}
DEFAULT_UNARCHIVE(spinidx)
//////////
-// functions overriding virtual functions from bases classes
+// functions overriding virtual functions from base classes
//////////
void idx::print(const print_context & c, unsigned level) const
{
- debugmsg("idx print", LOGLEVEL_PRINT);
-
if (is_of_type(c, print_tree)) {
c.s << std::string(level, ' ') << class_name()
} else {
- if (!is_of_type(c, print_latex))
+ if (is_a<print_latex>(c))
+ c.s << "{";
+ else
c.s << ".";
- bool need_parens = !(is_ex_exactly_of_type(value, numeric) || is_ex_of_type(value, symbol));
+ bool need_parens = !(is_exactly_a<numeric>(value) || is_a<symbol>(value));
if (need_parens)
c.s << "(";
value.print(c);
if (need_parens)
c.s << ")";
+ if (is_a<print_latex>(c))
+ c.s << "}";
}
}
void varidx::print(const print_context & c, unsigned level) const
{
- debugmsg("varidx print", LOGLEVEL_PRINT);
-
if (is_of_type(c, print_tree)) {
c.s << std::string(level, ' ') << class_name()
dim.print(c, level + delta_indent);
} else {
-
- if (!is_of_type(c, print_latex)) {
+ if (is_a<print_latex>(c))
+ c.s << "{";
+ else {
if (covariant)
c.s << ".";
else
c.s << "~";
}
- bool need_parens = !(is_ex_exactly_of_type(value, numeric) || is_ex_of_type(value, symbol));
+ bool need_parens = !(is_exactly_a<numeric>(value) || is_a<symbol>(value));
if (need_parens)
c.s << "(";
value.print(c);
if (need_parens)
c.s << ")";
+ if (is_a<print_latex>(c))
+ c.s << "}";
}
}
void spinidx::print(const print_context & c, unsigned level) const
{
- debugmsg("spinidx print", LOGLEVEL_PRINT);
-
if (is_of_type(c, print_tree)) {
c.s << std::string(level, ' ') << class_name()
} else {
bool is_tex = is_of_type(c, print_latex);
- if (!is_tex) {
+ if (is_tex) {
+ if (covariant)
+ c.s << "_{";
+ else
+ c.s << "^{";
+ } else {
if (covariant)
c.s << ".";
else
else
c.s << "*";
}
- bool need_parens = !(is_ex_exactly_of_type(value, numeric) || is_ex_of_type(value, symbol));
+ bool need_parens = !(is_exactly_a<numeric>(value) || is_a<symbol>(value));
if (need_parens)
c.s << "(";
value.print(c);
c.s << ")";
if (is_tex && dotted)
c.s << "}";
+ if (is_tex)
+ c.s << "}";
}
}
* must be such that dummy indices lie next to each other. */
int idx::compare_same_type(const basic & other) const
{
- GINAC_ASSERT(is_of_type(other, idx));
+ GINAC_ASSERT(is_a<idx>(other));
const idx &o = static_cast<const idx &>(other);
int cmpval = value.compare(o.value);
return dim.compare(o.dim);
}
+bool idx::match_same_type(const basic & other) const
+{
+ GINAC_ASSERT(is_a<idx>(other));
+ const idx &o = static_cast<const idx &>(other);
+
+ return dim.is_equal(o.dim);
+}
+
int varidx::compare_same_type(const basic & other) const
{
- GINAC_ASSERT(is_of_type(other, varidx));
+ GINAC_ASSERT(is_a<varidx>(other));
const varidx &o = static_cast<const varidx &>(other);
int cmpval = inherited::compare_same_type(other);
return 0;
}
+bool varidx::match_same_type(const basic & other) const
+{
+ GINAC_ASSERT(is_a<varidx>(other));
+ const varidx &o = static_cast<const varidx &>(other);
+
+ if (covariant != o.covariant)
+ return false;
+ return inherited::match_same_type(other);
+}
+
int spinidx::compare_same_type(const basic & other) const
{
- GINAC_ASSERT(is_of_type(other, spinidx));
+ GINAC_ASSERT(is_a<spinidx>(other));
const spinidx &o = static_cast<const spinidx &>(other);
// Check dottedness first so dummy indices will end up next to each other
return 0;
}
-bool idx::match(const ex & pattern, lst & repl_lst) const
+bool spinidx::match_same_type(const basic & other) const
{
- if (!is_ex_of_type(pattern, idx))
- return false;
- const idx &o = ex_to_idx(pattern);
- if (!dim.is_equal(o.dim))
- return false;
- return value.match(o.value, repl_lst);
-}
+ GINAC_ASSERT(is_a<spinidx>(other));
+ const spinidx &o = static_cast<const spinidx &>(other);
-bool varidx::match(const ex & pattern, lst & repl_lst) const
-{
- if (!is_ex_of_type(pattern, varidx))
- return false;
- const varidx &o = ex_to_varidx(pattern);
- if (covariant != o.covariant)
+ if (dotted != o.dotted)
return false;
- return inherited::match(pattern, repl_lst);
+ return inherited::match_same_type(other);
}
-bool spinidx::match(const ex & pattern, lst & repl_lst) const
+/** By default, basic::evalf would evaluate the index value but we don't want
+ * a.1 to become a.(1.0). */
+ex idx::evalf(int level) const
{
- if (!is_ex_of_type(pattern, spinidx))
- return false;
- const spinidx &o = ex_to_spinidx(pattern);
- if (dotted != o.dotted)
- return false;
- return inherited::match(pattern, repl_lst);
+ return *this;
}
ex idx::subs(const lst & ls, const lst & lr, bool no_pattern) const
// First look for index substitutions
for (unsigned i=0; i<ls.nops(); i++) {
- if (is_equal(*(ls.op(i)).bp)) {
+ if (is_equal(ex_to<basic>(ls.op(i)))) {
// Substitution index->index
- if (is_ex_of_type(lr.op(i), idx))
+ if (is_a<idx>(lr.op(i)))
return lr.op(i);
// Otherwise substitute value
return i_copy->setflag(status_flags::dynallocated);
}
+/** Implementation of ex::diff() for an index always returns 0.
+ *
+ * @see ex::diff */
+ex idx::derivative(const symbol & s) const
+{
+ return _ex0;
+}
+
//////////
// new virtual functions
//////////
{
const idx &o = static_cast<const idx &>(other);
- // Only pure symbols form dummy pairs, "2n+1" doesn't
- if (!is_ex_of_type(value, symbol))
+ // Only pure symbols form dummy pairs, numeric indices and expressions
+ // like "2n+1" don't
+ if (!is_a<symbol>(value))
return false;
// Value must be equal, of course
if (!value.is_equal(o.value))
return false;
- // Also the dimension
- return dim.is_equal(o.dim);
+ // Dimensions need not be equal but must be comparable (so we can
+ // determine the minimum dimension of contractions)
+ if (dim.is_equal(o.dim))
+ return true;
+
+ return (dim < o.dim || dim > o.dim || (is_exactly_a<numeric>(dim) && is_a<symbol>(o.dim)) || (is_a<symbol>(dim) && is_exactly_a<numeric>(o.dim)));
}
bool varidx::is_dummy_pair_same_type(const basic & other) const
// non-virtual functions
//////////
+ex idx::replace_dim(const ex & new_dim) const
+{
+ idx *i_copy = static_cast<idx *>(duplicate());
+ i_copy->dim = new_dim;
+ i_copy->clearflag(status_flags::hash_calculated);
+ return i_copy->setflag(status_flags::dynallocated);
+}
+
+ex idx::minimal_dim(const idx & other) const
+{
+ return GiNaC::minimal_dim(dim, other.dim);
+}
+
ex varidx::toggle_variance(void) const
{
varidx *i_copy = static_cast<varidx *>(duplicate());
bool is_dummy_pair(const ex & e1, const ex & e2)
{
// The expressions must be indices
- if (!is_ex_of_type(e1, idx) || !is_ex_of_type(e2, idx))
+ if (!is_a<idx>(e1) || !is_a<idx>(e2))
return false;
- return is_dummy_pair(ex_to_idx(e1), ex_to_idx(e2));
+ return is_dummy_pair(ex_to<idx>(e1), ex_to<idx>(e2));
}
void find_free_and_dummy(exvector::const_iterator it, exvector::const_iterator itend, exvector & out_free, exvector & out_dummy)
// Only one index? Then it is a free one if it's not numeric
if (itend - it == 1) {
- if (ex_to_idx(*it).is_symbolic())
+ if (ex_to<idx>(*it).is_symbolic())
out_free.push_back(*it);
return;
}
// Sort index vector. This will cause dummy indices come to lie next
// to each other (because the sort order is defined to guarantee this).
exvector v(it, itend);
- shaker_sort(v.begin(), v.end(), ex_is_less());
+ shaker_sort(v.begin(), v.end(), ex_is_less(), ex_swap());
// Find dummy pairs and free indices
it = v.begin(); itend = v.end();
if (it == itend)
return;
} else {
- if (!it->is_equal(*last) && ex_to_idx(*last).is_symbolic())
+ if (!it->is_equal(*last) && ex_to<idx>(*last).is_symbolic())
out_free.push_back(*last);
}
last = it++;
}
- if (ex_to_idx(*last).is_symbolic())
+ if (ex_to<idx>(*last).is_symbolic())
out_free.push_back(*last);
}
+ex minimal_dim(const ex & dim1, const ex & dim2)
+{
+ if (dim1.is_equal(dim2) || dim1 < dim2 || (is_exactly_a<numeric>(dim1) && is_a<symbol>(dim2)))
+ return dim1;
+ else if (dim1 > dim2 || (is_a<symbol>(dim1) && is_exactly_a<numeric>(dim2)))
+ return dim2;
+ else {
+ std::ostringstream s;
+ s << "minimal_dim(): index dimensions " << dim1 << " and " << dim2 << " cannot be ordered";
+ throw (std::runtime_error(s.str()));
+ }
+}
+
} // namespace GiNaC
git://www.ginac.de / ginac.git / blobdiff