/usr/include/dune/localfunctions/lagrange/prismp2/prismp2localinterpolation.hh is in libdune-localfunctions-dev 2.2.1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#ifndef DUNE_PRISM_P2_LOCALINTERPOLATION_HH
#define DUNE_PRISM_P2_LOCALINTERPOLATION_HH
#include <vector>
namespace Dune
{
template<class LB>
class PrismP2LocalInterpolation
{
public:
//! \brief Local interpolation of a function
template<typename F, typename C>
void interpolate (const F& f, std::vector<C>& out) const
{
typename LB::Traits::RangeType y;
out.resize(18);
typename LB::Traits::DomainType x;
x[0] = 0.0; x[1] = 0.0; x[2] = 0.0;
f.evaluate(x,y); out[0] = y;
x[0] = 1.0; x[1] = 0.0; x[2] = 0.0;
f.evaluate(x,y); out[1] = y;
x[0] = 0.0; x[1] = 1.0; x[2] = 0.0;
f.evaluate(x,y); out[2] = y;
x[0] = 0.0; x[1] = 0.0; x[2] = 1.0;
f.evaluate(x,y); out[3] = y;
x[0] = 1.0; x[1] = 0.0; x[2] = 1.0;
f.evaluate(x,y); out[4] = y;
x[0] = 0.0; x[1] = 1.0; x[2] = 1.0;
f.evaluate(x,y); out[5] = y;
x[0] = 0.0; x[1] = 0.0; x[2] = 0.5;
f.evaluate(x,y); out[6] = y;
x[0] = 1.0; x[1] = 0.0; x[2] = 0.5;
f.evaluate(x,y); out[7] = y;
x[0] = 0; x[1] = 1.0; x[2] = 0.5;
f.evaluate(x,y); out[8] = y;
x[0] = 0.5; x[1] = 0.0; x[2] = 0.0;
f.evaluate(x,y); out[9] = y;
x[0] = 0.0; x[1] = 0.5; x[2] = 0.0;
f.evaluate(x,y); out[10] = y;
x[0] = 0.5; x[1] = 0.5; x[2] = 0.0;
f.evaluate(x,y); out[11] = y;
x[0] = 0.5; x[1] = 0.0; x[2] = 1.0;
f.evaluate(x,y); out[12] = y;
x[0] = 0.0; x[1] = 0.5; x[2] = 1.0;
f.evaluate(x,y); out[13] = y;
x[0] = 0.5; x[1] = 0.5; x[2] = 1.0;
f.evaluate(x,y); out[14] = y;
x[0] = 0.5; x[1] = 0.0; x[2] = 0.5;
f.evaluate(x,y); out[15] = y;
x[0] = 0.0; x[1] = 0.5; x[2] = 0.5;
f.evaluate(x,y); out[16] = y;
x[0] = 0.5; x[1] = 0.5; x[2] = 0.5;
f.evaluate(x,y); out[17] = y;
}
};
}
#endif
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