Internal storage class for alpha_s interpolation grids. More...

#include <KnotArray.h>

Public Member Functions
Construction etc.
	AlphaSArray ()
	Default constructor just for std::map insertability.

	AlphaSArray (const std::vector< double > &q2knots, const std::vector< double > &as)
	Constructor from Q2 knot values and alpha_s values.

Q2 stuff
const std::vector< double > &	q2s () const
	Q2 knot vector accessor.

const std::vector< double > &	logq2s () const
	log(Q2) knot vector accessor

size_t	iq2below (double q2) const

size_t	ilogq2below (double logq2) const

alpha_s values at Q2 points
const std::vector< double > &	alphas () const
	alpha_s value accessor (const)

alpha_s derivatives vs (log)Q2, useful for interpolation
double	ddlogq_forward (size_t i) const
	Forward derivative w.r.t. logQ2.

double	ddlogq_backward (size_t i) const
	Backward derivative w.r.t. logQ2.

double	ddlogq_central (size_t i) const
	Central (avg of forward and backward) derivative w.r.t. logQ2.

Private Member Functions
void	_syncq2s ()
	Synchronise the log(Q2) array from the Q2 one.

Private Attributes
std::vector< double >	_q2s
	List of Q2 knots.

std::vector< double >	_logq2s
	List of log(Q2) knots.

std::vector< double >	_as
	List of alpha_s values across the knot array.

Detailed Description

Internal storage class for alpha_s interpolation grids.

Member Function Documentation

size_t LHAPDF::AlphaSArray::ilogq2below ( double logq2 ) const

inline

Get the index of the closest logQ2 knot row <= logq2

If the value is >= q2_max, return i_max-1 (for polynomial spine construction)

Find the closest knot below the requested value

size_t LHAPDF::AlphaSArray::iq2below ( double q2 ) const

inline

Get the index of the closest Q2 knot row <= q2

If the value is >= q2_max, return i_max-1 (for polynomial spine construction)

Find the closest knot below the requested value

The documentation for this class was generated from the following file: