/usr/include/dune/localfunctions/lagrange/q2/q2localinterpolation.hh is in libdune-localfunctions-dev 2.3.1-1.
This file is owned by root:root, with mode 0o644.
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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 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 | // -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
// vi: set et ts=4 sw=2 sts=2:
#ifndef DUNE_Q2_LOCALINTERPOLATION_HH
#define DUNE_Q2_LOCALINTERPOLATION_HH
#include <cstddef>
#include <vector>
namespace Dune
{
template<class LB>
class Q2LocalInterpolation
{
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::DomainType x;
typename LB::Traits::RangeType y;
static const int dim = LB::Traits::dimDomain;
// Compute number of Lagrange points
size_t size = 1;
for (int i=0; i<dim; i++)
size *= 3;
out.resize(size);
for (size_t i=0; i<size; i++) {
// Construct the i-th Lagrange point
size_t ternary = i;
for (int j=0; j<dim; j++) {
int digit = ternary%3;
ternary /= 3;
x[j] = digit*0.5;
}
// Evaluate the function at this point
f.evaluate(x,y);
out[i] = y;
}
}
};
}
#endif
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