/usr/include/dune/common/precision.hh is in libdune-common-dev 2.4.1-1.
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_PRECISION_HH
#define DUNE_PRECISION_HH
/** \file
* \brief Various precision settings for calculations with FieldMatrix and FieldVector
*/
#include <stdlib.h>
namespace Dune {
/**
@addtogroup DenseMatVec
@{
*/
/**
* @brief Precisions for calculations with FieldMatrix and FieldVector.
*/
template <class ctype = double>
class FMatrixPrecision {
public:
//! return threshold to do pivoting
static ctype pivoting_limit ()
{
return _pivoting;
}
//! set pivoting threshold
static void set_pivoting_limit (ctype pivthres)
{
_pivoting = pivthres;
}
//! return threshold to declare matrix singular
static ctype singular_limit ()
{
return _singular;
}
//! set singular threshold
static void set_singular_limit (ctype singthres)
{
_singular = singthres;
}
//! return threshold to declare matrix singular
static ctype absolute_limit ()
{
return _absolute;
}
//! set singular threshold
static void set_absolute_limit (ctype absthres)
{
_absolute = absthres;
}
private:
// just to demonstrate some state information
static ctype _pivoting;
static ctype _singular;
static ctype _absolute;
};
template <class ctype>
ctype FMatrixPrecision<ctype>::_pivoting = 1E-8;
template <class ctype>
ctype FMatrixPrecision<ctype>::_singular = 1E-14;
template <class ctype>
ctype FMatrixPrecision<ctype>::_absolute = 1E-80;
/** @} end documentation */
} // end namespace
#endif
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