Mercurial > fem-fenics-eugenio
view src/feval.cc @ 216:a28b50969020
New version of feval which accept a matrix or an array as points
where the evaluation is done.
author | gedeone-octave <marcovass89@hotmail.it> |
---|---|
date | Wed, 05 Mar 2014 11:59:02 +0000 |
parents | ca7eb016cf64 |
children | b07ec30369ab |
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/* Copyright (C) 2013 Marco Vassallo <gedeone-octave@users.sourceforge.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 3 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 "function.h" DEFUN_DLD (feval, args, , "-*- texinfo -*-\n\ @deftypefn {Function File} {[@var{value}]} = \ feval (@var{function_name}, @var{Coordinate})\n\ Evaluate a function at a specific point of the domain and return the value. \n\ The input parameters are the function and the point where it has to\ be evaluated.\n\ The point can be either a vector or a matrix. If it is a matrix, each column\ represents a different point at which we evaluates the function.\n\ @seealso{Function}\n\ @end deftypefn") { int nargin = args.length (); octave_value retval=0; if (nargin < 2 || nargin > 2) print_usage (); else { if (! function_type_loaded) { function::register_type (); function_type_loaded = true; mlock (); } if (args(0).type_id () == function::static_type_id ()) { const function & fspo = static_cast<const function&> (args(0).get_rep ()); Matrix point= args(1).matrix_value (); if (!error_state) { const boost::shared_ptr<const dolfin::Function> & f = fspo.get_pfun (); if (point.rows () == 1) point = point.transpose (); dim_vector dims; dims.resize (2); dims(0) = f->value_dimension (0); dims(1) = point.cols (); Matrix res (dims); dim_vector dims_tmp; dims_tmp.resize (2); dims_tmp(0) = f->value_dimension (0); dims_tmp(1) = 1; Array<double> res_tmp (dims_tmp); for (uint i = 0; i < point.cols (); ++i) { Array<double> point_tmp = point.column (i); dolfin::Array<double> x (point_tmp.length (), point_tmp.fortran_vec ()); dolfin::Array<double> values (res_tmp.length (), res_tmp.fortran_vec ()); f->eval (values, x); for (uint j = 0; j < res_tmp.length (); ++j) res(i, j) = res_tmp (j); } retval = octave_value (res); } } } return retval; }