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/*
Copyright (C) 2003 Willem J. Atsma <watsma@users.sf.net>
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
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; If not, see <http://www.gnu.org/licenses/>.
*/
#include <octave/oct.h>
#include <octave/quit.h>
#include <ginac/ginac.h>
#include "ov-ex.h"
#include "symbols.h"
DEFUN_DLD(sumterms,args, ,
"-*- texinfo -*-\n\
@deftypefn {Loadable Function} {@var{terms} =} sumterms(@var{f})\n\
\n\
Returns a list of terms that are summed in expression @var{f}.\n\
@end deftypefn")
{
GiNaC::ex expression;
octave_value retval;
octave_value_list termlist;
int nargin = args.length();
if (nargin != 1) {
error("Need one argument.");
return retval;
}
try {
if (!get_expression (args(0), expression)) {
error("Argument must be a symbolic expression.");
return retval;
}
if(GiNaC::is_a<GiNaC::add>(expression)) {
int i, n = expression.nops();
for(i=0;i<n;i++) {
OCTAVE_QUIT;
termlist.append(octave_value(new octave_ex(expression.op(i))));
}
} else {
// no sum terms, return expression
termlist.append(octave_value(new octave_ex(expression)));
}
retval = Cell (termlist);
} catch (std::exception &e) {
error (e.what ());
retval = octave_value ();
}
return retval;
}