/usr/include/dune/localfunctions/lagrange/qk/qklocalinterpolation.hh is in libdune-localfunctions-dev 2.5.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// vi: set et ts=4 sw=2 sts=2:
#ifndef DUNE_LOCALFUNCTIONS_QKLOCALINTERPOLATION_HH
#define DUNE_LOCALFUNCTIONS_QKLOCALINTERPOLATION_HH
#include <dune/common/fvector.hh>
#include <dune/common/power.hh>
#include <dune/geometry/type.hh>
#include <dune/localfunctions/common/localbasis.hh>
#include <dune/localfunctions/common/localfiniteelementtraits.hh>
namespace Dune
{
/** \todo Please doc me! */
template<int k, int d, class LB>
class QkLocalInterpolation
{
// Return i as a d-digit number in the (k+1)-nary system
static Dune::FieldVector<int,d> multiindex (int i)
{
Dune::FieldVector<int,d> alpha;
for (int j=0; j<d; j++)
{
alpha[j] = i % (k+1);
i = i/(k+1);
}
return alpha;
}
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;
out.resize(StaticPower<k+1,d>::power);
for (int i=0; i<StaticPower<k+1,d>::power; i++)
{
// convert index i to multiindex
Dune::FieldVector<int,d> alpha(multiindex(i));
// Generate coordinate of the i-th Lagrange point
for (int j=0; j<d; j++)
x[j] = (1.0*alpha[j])/k;
f.evaluate(x,y); out[i] = y;
}
}
};
/** \todo Please doc me! */
template<int d, class LB>
class QkLocalInterpolation<0,d,LB>
{
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(0);
typename LB::Traits::RangeType y;
f.evaluate(x,y);
out.resize(1);
out[0] = y;
}
};
}
#endif
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