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rGOOSEFEM/tests/basic/MatrixDiagonal.cpp
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MatrixDiagonal.cpp
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#include <catch2/catch.hpp>
#include <xtensor/xrandom.hpp>
#include <GooseFEM/MatrixDiagonal.h>
#include <GooseFEM/MeshQuad4.h>
#include <GooseFEM/ElementQuad4.h>
#include <GooseFEM/Vector.h>
#define ISCLOSE(a,b) REQUIRE_THAT((a), Catch::WithinAbs((b), 1.e-12));
TEST_CASE("GooseFEM::MatrixDiagonal", "MatrixDiagonal.h")
{
SECTION("assemble")
{
GooseFEM::Mesh::Quad4::Regular mesh(2, 2);
GooseFEM::Vector vector(mesh.conn(), mesh.dofs());
GooseFEM::MatrixDiagonal A(mesh.conn(), mesh.dofs());
GooseFEM::Element::Quad4::Quadrature quad(
vector.AsElement(mesh.coor()),
GooseFEM::Element::Quad4::Nodal::xi(),
GooseFEM::Element::Quad4::Nodal::w());
xt::xtensor<double, 2> val_quad = xt::empty<double>({mesh.nelem(), quad.nip()});
for (size_t q = 0; q < quad.nip(); ++q) {
xt::view(val_quad, xt::all(), q) = 1.0;
}
A.assemble(quad.Int_N_scalar_NT_dV(val_quad));
xt::xtensor<double, 1> a = {0.25, 0.25,
0.5 , 0.5 ,
0.25, 0.25,
0.5 , 0.5 ,
1.0 , 1.0 ,
0.5 , 0.5 ,
0.25, 0.25,
0.5 , 0.5 ,
0.25, 0.25};
REQUIRE(xt::allclose(A.Todiagonal(), a));
}
SECTION("dot")
{
GooseFEM::Mesh::Quad4::Regular mesh(2, 2);
xt::xtensor<double, 1> a = xt::random::rand<double>({mesh.nnode() * mesh.ndim()});
xt::xtensor<double, 1> x = xt::random::rand<double>({mesh.nnode() * mesh.ndim()});
xt::xtensor<double, 1> b = a * x;
GooseFEM::MatrixDiagonal A(mesh.conn(), mesh.dofs());
A.set(a);
xt::xtensor<double, 1> B = A.Dot(x);
REQUIRE(B.size() == b.size());
REQUIRE(xt::allclose(B, b));
REQUIRE(xt::allclose(A.Todiagonal(), a));
}
SECTION("solve")
{
GooseFEM::Mesh::Quad4::Regular mesh(2, 2);
xt::xtensor<double, 1> a = xt::random::rand<double>({mesh.nnode() * mesh.ndim()});
xt::xtensor<double, 1> x = xt::random::rand<double>({mesh.nnode() * mesh.ndim()});
xt::xtensor<double, 1> b = a * x;
GooseFEM::MatrixDiagonal A(mesh.conn(), mesh.dofs());
A.set(a);
xt::xtensor<double, 1> B = A.Dot(x);
xt::xtensor<double, 1> X = A.Solve(B);
REQUIRE(B.size() == b.size());
REQUIRE(X.size() == x.size());
REQUIRE(xt::allclose(B, b));
REQUIRE(xt::allclose(X, x));
}
}
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