/usr/include/dune/localfunctions/lagrange/p0/p0localinterpolation.hh is in libdune-localfunctions-dev 2.3.1-1.
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 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 | // -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
// vi: set et ts=4 sw=2 sts=2:
#ifndef DUNE_P0LOCALINTERPOLATION_HH
#define DUNE_P0LOCALINTERPOLATION_HH
#include <vector>
#include <dune/geometry/referenceelements.hh>
namespace Dune
{
template<class LB>
class P0LocalInterpolation
{
public:
P0LocalInterpolation (const GeometryType& gt) : gt_(gt)
{}
//! determine coefficients interpolating a given function
template<typename F, typename C>
void interpolate (const F& f, std::vector<C>& out) const
{
typedef typename LB::Traits::DomainType DomainType;
typedef typename LB::Traits::RangeType RangeType;
typedef typename LB::Traits::DomainFieldType DF;
const int dim=LB::Traits::dimDomain;
DomainType x = Dune::ReferenceElements<DF,dim>::general(gt_).position(0,0);
RangeType y;
out.resize(1);
f.evaluate(x,y); out[0] = y;
}
private:
GeometryType gt_;
};
}
#endif
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