Internal storage class for PDF data point grids. More...

#include <KnotArray.h>

Public Member Functions
	KnotArray1F ()
	Default constructor just for std::map insertability.

	KnotArray1F (const std::vector< double > &xknots, const std::vector< double > &q2knots, const std::vector< double > &xfs)
	Constructor from x and Q2 knot values, and an xf value grid as strided list.

	KnotArray1F (const std::vector< double > &xknots, const std::vector< double > &q2knots)
	Constructor of a zero-valued array from x and Q2 knot values.

x stuff
void	setxs (const std::vector< double > &xs)

size_t	xsize () const
	Number of x knots.

const std::vector< double > &	xs () const
	x knot accessor

const std::vector< double > &	logxs () const
	log(x) knot accessor

bool	samexs (const KnotArray1F &other) const
	Hash comparator.

size_t	xhash () const

size_t	ixbelow (double x) const
	Get the index of the closest x knot row <= x. More...

Q2 stuff
void	setq2s (const std::vector< double > &q2s)

size_t	q2size () const
	Number of Q2 knots.

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

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

bool	sameq2s (const KnotArray1F &other) const
	Hash comparator for Q2 knots.

size_t	q2hash () const

size_t	iq2below (double q2) const

PDF values at (x, Q2) points
size_t	size () const
	Number of x knots.

const std::vector< double > &	xfs () const
	xf value accessor (const)

std::vector< double > &	xfs ()
	xf value accessor (non-const)

void	setxfs (const std::vector< double > &xfs)
	xf value setter

const double &	xf (size_t ix, size_t iq2) const
	Get the xf value at a particular indexed x,Q2 knot.

Private Member Functions
void	_syncx ()
	Synchronise log(x) array and hash from the x array.

void	_syncq2 ()
	Synchronise log(x) and log(Q2) arrays from the x and Q2 ones.

size_t	_mkhash (const std::vector< double > &xx) const
	Utility function for making a hash code from a vector<double>

Private Attributes
std::vector< double >	_xs
	List of x knots.

std::vector< double >	_logxs
	List of log(x) knots, precomputed for efficiency.

size_t	_xgridhash = 0
	Hash for this set of x knots.

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

std::vector< double >	_logq2s
	List of log(Q2) knots, precomputed for efficiency.

size_t	_q2gridhash = 0
	Hash for this set of Q2 knots.

std::vector< double >	_xfs
	List of xf values across the 2D knot array, stored as a strided [ix][iQ2] 1D array.

Detailed Description

Internal storage class for PDF data point grids.

We use "array" to refer to the "raw" knot grid, while "grid" means a grid-based PDF. The "1F" means that this is a single-flavour array

Member Function Documentation

size_t LHAPDF::KnotArray1F::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

size_t LHAPDF::KnotArray1F::ixbelow ( double x ) const

inline

Get the index of the closest x knot row <= x.

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

void LHAPDF::KnotArray1F::setq2s ( const std::vector< double > & q2s )

inline

Q2 knot setter

Note: Also zeros the xfs array, which is invalidated by resetting the Q2 knots

void LHAPDF::KnotArray1F::setxs ( const std::vector< double > & xs )

inline

x knot setter

Note: Also zeros the xfs array, which is invalidated by resetting the x knots

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