/usr/share/doc/rheolef-doc/examples/helmholtz_s.cc is in rheolef-doc 6.5-1.
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 | #include "rheolef.h"
using namespace rheolef;
using namespace std;
#include "sphere.icc"
int main(int argc, char**argv) {
environment rheolef(argc, argv);
geo gamma (argv[1]);
size_t d = gamma.dimension();
space Wh (gamma, argv[2]);
trial u (Wh); test v (Wh);
form a = integrate (u*v + dot(grad_s(u),grad_s(v)));
field lh = integrate (f(d)*v);
field uh (Wh);
solver sa (a.uu());
uh.set_u() = sa.solve (lh.u() - a.ub()*uh.b());
dout << uh;
}
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