/usr/share/doc/rheolef-doc/examples/p-laplacian-fixed-point.cc is in rheolef-doc 5.93-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 | #include "rheolef.h"
using namespace rheolef;
using namespace std;
#include "p-laplacian-fixed-point.h"
#include "poisson-dirichlet.icc"
int main(int argc, char**argv) {
geo omega_h (argv[1]);
string approx = (argc > 2) ? argv[2] : "P1";
Float p = (argc > 3) ? atof(argv[3]) : 2.5;
cerr << "# P-Laplacian problem by fixed-point:" << endl
<< "# geo = " << omega_h.name() << endl
<< "# approx = " << approx << endl
<< "# p = " << p << endl;
space Vh (omega_h, approx);
Vh.block (omega_h["boundary"]);
field uh (Vh);
uh ["boundary"] = 0;
field fh (Vh, 1);
poisson_dirichlet (fh, uh);
Float tol = 10*numeric_limits<Float>::epsilon();
size_t max_iter = 500;
int status = p_laplacian_fixed_point (p, fh, uh, tol, max_iter);
cout << setprecision(numeric_limits<Float>::digits10)
<< catchmark("p") << p << endl
<< catchmark("u") << uh;
return status;
}
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