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Expression.cc    72 lines (60 with data), 2.2 kB

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/*
Copyright (C) 2013 Marco Vassallo
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 "coefficient.h"
DEFUN_DLD (Expression, args, , "-*- texinfo -*-\n\
@deftypefn {Function File} {[@var{f}]} = \
Expression (@var{name}, @var{Functio handle}\n\
The input parameters are\n\
@itemize @bullet \n\
@item @var{name} is the name of the coefficient declared in the .ufl file\n\
@item @var{Functio handle} is a function handle which contains the expression\
that we want to apply for our coefficient\n\
@end itemize\n\
The output @var{f} is an object which contains a representation of the function\n\
@seealso{Constant, Function}\n\
@end deftypefn")
{
int nargin = args.length ();
octave_value retval;
if (nargin < 2 || nargin > 2)
print_usage ();
else
{
std::string str = args(0).string_value ();
octave_fcn_handle * fh = args(1).fcn_handle_value ();
if (! coefficient_type_loaded)
{
coefficient::register_type ();
coefficient_type_loaded = true;
mlock ();
}
if (!error_state)
{
std::cout << "Creating expression..."<< std::endl;
octave_value_list b (3, 1);
octave_value_list tmp = feval (fh->function_value (), b);
Array<double> res = tmp(0).array_value ();
std::size_t l = res.length ();
/*
Look at the discussion
http://fenicsproject.org/qa/781/scalar-and-vector-valued-expression
*/
if (l > 1)
retval = new coefficient (str, *fh, l);
else
retval = new coefficient (str, *fh);
}
}
return retval;
}