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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 <dolfin.h>
#include "functionspace.h"
#include "function.h"
DEFUN_DLD (Function, args, , "-*- texinfo -*-\n\
@deftypefn {Function File} {[@var{func}]} = \
Function (@var{name}, @var{FunctionSpace} (or @var{Function}),\
@var{Vector} (or @var{index}))\n\
Initialize an object with the values specified in a vector or extracting \
a component from a vectorial field.\n\
This function can be used in two different ways\n\
@itemize @bullet \n\
@item To create a function from a vector. In this case, the arguments are:\n\
@itemize @bullet \n\
@item @var{name} is a string representing the name of the function\n\
@item @var{FunctionSpace} is the fem-fenics function space where \
the vector is defined\n\
@item @var{Vector} specifies the values of the coefficients\
for each basisc function of the @var{FunctioSpace}\n\
@end itemize\n\
@item To extract a scalar field from a vectorial one\n\
@itemize @bullet \n\
@item @var{name} is a string representing the name of the function\n\
@item @var{Function} is the vector valued Function\n\
@item @var{Index} contains the index of the scalar field to extract.\
Index starts from 1. \n\
@end itemize\n\
@end itemize \n\
The output @var{func} is an object which contains a representation of the \
function @var{Vector} which can be plotted or saved or passed as argument \
for a variational problem.\n\
@seealso{Constant, Expression, plot, save}\n\
@end deftypefn")
{
int nargin = args.length ();
octave_value retval;
if (nargin < 3 || nargin > 3)
print_usage ();
else
{
if (! functionspace_type_loaded)
{
functionspace::register_type ();
functionspace_type_loaded = true;
mlock ();
}
if (! function_type_loaded)
{
function::register_type ();
function_type_loaded = true;
mlock ();
}
if (args(1).type_id () == functionspace::static_type_id ())
{
std::string str = args(0).string_value ();
const functionspace & fspo =
static_cast<const functionspace&> (args(1).get_rep ());
Array <double> myu = args(2).array_value ();
if (!error_state)
{
const boost::shared_ptr<const dolfin::FunctionSpace>
& V = fspo.get_pfsp ();
if (V->dim () != myu.length ())
error("The size of the functional space \
and of the vector must agree");
else
{
dolfin::Vector du(myu.length ());
for (std::size_t i = 0; i < myu.length (); ++i)
du.setitem (i, myu(i));
boost::shared_ptr<dolfin::Vector>
uu (new dolfin::Vector(du));
boost::shared_ptr <const dolfin::Function>
u (new dolfin::Function(V, uu));
retval = new function (str, u);
}
}
}
else if (args(1).type_id () == function::static_type_id ())
{
std::string str = args(0).string_value ();
const function & fspo =
static_cast<const function&> (args(1).get_rep ());
int idx = args(2).int_value ();
if (!error_state)
{
const boost::shared_ptr<const dolfin::Function>
& f = fspo.get_pfun ();
if (f->value_rank () < 1)
error ("Function: The function you provided\
isn't a vecotr field");
else
{
if (idx < 1 || idx > f->value_dimension (0))
error ("Function: index out of bounds");
else
{
boost::shared_ptr <const dolfin::Function>
u (new dolfin::Function((*f)[idx - 1]));
retval = new function (str, u);
}
}
}
}
}
return retval;
}

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