BSpline2d Class Reference

b spline interpolation More...

#include <OpenMS/MATH/MISC/BSpline2d.h>

Public Types
enum	BoundaryCondition { BC_ZERO_ENDPOINTS = 0, BC_ZERO_FIRST = 1, BC_ZERO_SECOND = 2 }

Public Member Functions
	BSpline2d (const std::vector< double > &x, const std::vector< double > &y, double wavelength=0, BoundaryCondition boundary_condition=BC_ZERO_SECOND, Size num_nodes=0)
virtual	~BSpline2d ()
bool	solve (const std::vector< double > &y)
double	eval (const double x) const
double	derivative (const double x) const
double	derivatives (double x, unsigned order=1) const
bool	ok () const

Static Public Member Functions
static void	debug (bool enable)

Private Attributes
eol_bspline::BSpline< double > *	spline_

Detailed Description

b spline interpolation

Member Enumeration Documentation

BoundaryCondition

enum BoundaryCondition

Enumerator
BC_ZERO_ENDPOINTS	Set the endpoints of the spline to zero.
BC_ZERO_FIRST	Set the first derivative of the spline to zero at the endpoints.
BC_ZERO_SECOND	Set the second derivative to zero.

Constructor & Destructor Documentation

BSpline2d()

BSpline2d	(	const std::vector< double > &	x,
		const std::vector< double > &	y,
		double	wavelength = 0,
		BoundaryCondition	boundary_condition = BC_ZERO_SECOND,
		Size	num_nodes = 0
	)

Create a single spline with the parameters required to set up the domain and subsequently smooth the given set of y values. The y values must correspond to each of the x values. If either the domain setup fails or the spline cannot be solved, the state will be set to "not OK".

See also

ok().

Parameters

x	The array of x values in the domain.
y	The array of y values corresponding to each of the x values in the domain.
wavelength	The cutoff wavelength, in the same units as the x values. A wavelength of zero disables the derivative constraint.
boundary_condition	The boundary condition type. If omitted it defaults to BC_ZERO_SECOND.
num_nodes	The number of nodes to use for the cubic b-spline. If less than 2, a "reasonable" number will be calculated automatically, taking into account the given cutoff wavelength.

Precondition

x and y must be of the same dimensions.

~BSpline2d()

virtual ~BSpline2d ( )

virtual

Destructor

Member Function Documentation

debug()

static void debug ( bool  enable )

static

Enable or disable debug messages from the B-spline library.

derivative()

double derivative

(

const double

x

)

const

Return the first derivative of the spline curve at the given x. Returns zero if the current state is not ok().

derivatives()

double derivatives	(	double	x,
		unsigned	order = 1
	)		const

Return the first derivative of the spline curve at the given x. Returns zero if the current state is not ok().

eval()

double eval

(

const double

x

)

const

Return the evaluation of the smoothed curve at a particular x value. If current state is not ok(), returns zero.

ok()

bool ok

(

)

const

Return whether the spline fit was successful.

solve()

bool solve

(

const std::vector< double > &

y

)

Solve the spline curve for a new set of y values. Returns false if the solution fails.

Parameters

y	The array of y values corresponding to each of the x values in the domain.

Member Data Documentation

spline_

eol_bspline::BSpline<double>* spline_

private