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// Copyright (C) 2007 Anders Logg
//
// This file is part of DOLFIN.
//
// DOLFIN is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// DOLFIN 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 Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with DOLFIN. If not, see <http://www.gnu.org/licenses/>.
//
// Unit tests for the function library
#include <dolfin.h>
#include "Projection.h"
#include <catch.hpp>
using namespace dolfin;
namespace
{
void arbitrary_eval()
{
class F0 : public Expression
{
public:
F0() {}
void eval(Array<double>& values, const Array<double>& x) const
{ values[0] = sin(3.0*x[0])*sin(3.0*x[1])*sin(3.0*x[2]); }
};
class F1 : public Expression
{
public:
F1() {}
void eval(Array<double>& values, const Array<double>& x) const
{ values[0] = 1.0 + 3.0*x[0] + 4.0*x[1] + 0.5*x[2]; }
};
auto mesh = std::make_shared<UnitCubeMesh>(8, 8, 8);
Array<double> x(3);
x[0] = 0.31; x[1] = 0.32; x[2] = 0.33;
Array<double> u0(1);
Array<double> u1(1);
// User-defined functions (one from finite element space, one not)
F0 f0;
auto f1 = std::make_shared<F1>();
// Test evaluation of a user-defined function
f0.eval(u0, x);
CHECK(u0[0] == Approx(sin(3.0*x[0])*sin(3.0*x[1])*sin(3.0*x[2])));
// Test for single core only
if (dolfin::MPI::size(mesh->mpi_comm()) == 1)
{
// Test evaluation of a discrete function
auto V = std::make_shared<Projection::FunctionSpace>(mesh);
Projection::BilinearForm a(V, V);
Projection::LinearForm L(V);
L.f = f1;
Function g(V);
solve(a == L, g);
const double tol = 1.0e-6;
f1->eval(u0, x);
g.eval(u1, x);
CHECK(std::abs(u0[0] - u1[0]) < tol);
}
}
}
//-----------------------------------------------------------------------------
TEST_CASE( "Test arbitray eval", "[eval]" )
{
CHECK_NOTHROW(arbitrary_eval());
}
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