/usr/include/dune/localfunctions/lagrange/p0/p0localbasis.hh is in libdune-localfunctions-dev 2.3.1-1.
This file is owned by root:root, with mode 0o644.
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// vi: set et ts=4 sw=2 sts=2:
#ifndef DUNE_P0LOCALBASIS_HH
#define DUNE_P0LOCALBASIS_HH
#include <dune/common/fmatrix.hh>
#include <dune/localfunctions/common/localbasis.hh>
namespace Dune
{
/**@ingroup LocalBasisImplementation
\brief Constant shape function
Defines the constant scalar shape function in d dimensions. Is
valid on any type of reference element.
\tparam D Type to represent the field in the domain.
\tparam R Type to represent the field in the range.
\tparam d Domain dimension
\nosubgrouping
*/
template<class D, class R, int d>
class P0LocalBasis
{
public:
//! \brief export type traits for function signature
typedef LocalBasisTraits<D,d,Dune::FieldVector<D,d>,R,1,Dune::FieldVector<R,1>,
Dune::FieldMatrix<R,1,d>, 0> Traits;
//! \brief number of shape functions
unsigned int size () const
{
return 1;
}
//! \brief Evaluate all shape functions
inline void evaluateFunction (const typename Traits::DomainType& in,
std::vector<typename Traits::RangeType>& out) const
{
out.resize(1);
out[0] = 1;
}
//! \brief Evaluate Jacobian of all shape functions
inline void
evaluateJacobian (const typename Traits::DomainType& in, // position
std::vector<typename Traits::JacobianType>& out) const // return value
{
out.resize(1);
for (int i=0; i<d; i++)
out[0][0][i] = 0;
}
//! \brief Polynomial order of the shape functions
unsigned int order () const
{
return 0;
}
};
}
#endif
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