Rheolef  7.1
an efficient C++ finite element environment
level_set_sphere_check.cc
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1 #include "rheolef.h"
22 using namespace rheolef;
23 using namespace std;
24 #include "sphere.icc"
25 int main (int argc, char**argv) {
26  environment rheolef (argc,argv);
27  Float tol = (argc > 1) ? atof(argv[1]) : 1e+38;
28  geo gamma_h;
29  din >> gamma_h;
30  space Wh (gamma_h, "P1");
31  trial u (Wh); test v (Wh);
32  form m = integrate (u*v);
33  field one (Wh, 1);
34  Float meas_gamma_h = m(one,one);
35  size_t d = gamma_h.dimension();
36  Float pi = acos(Float(-1));
37  Float meas_gamma = (d == 3) ? 4*pi : 2*pi;
38  Float err = fabs(meas_gamma - meas_gamma_h);
39  dout << "meas(gamma_h) = " << meas_gamma_h << endl
40  << "meas(gamma) = " << meas_gamma << endl
41  << "err = " << err << endl;
42  return (err < tol) ? 0 : 1;
43 }
see the Float page for the full documentation
see the field page for the full documentation
see the form page for the full documentation
see the geo page for the full documentation
see the environment page for the full documentation
Definition: environment.h:104
double Float
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Definition: Float.h:143
idiststream din
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Definition: diststream.h:427
odiststream dout(cout)
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Definition: diststream.h:430
see the space page for the full documentation
see the test page for the full documentation
see the test page for the full documentation
int main(int argc, char **argv)
This file is part of Rheolef.
std::enable_if< details::is_field_expr_v2_nonlinear_arg< Expr >::value &&! is_undeterminated< Result >::value, Result >::type integrate(const geo_basic< T, M > &omega, const Expr &expr, const integrate_option &iopt, Result dummy=Result())
see the integrate page for the full documentation
Definition: integrate.h:202
rheolef - reference manual
The level set function for the sphere geometry.
Definition: leveque.h:25
Float u(const point &x)