ru.sscc.spline.polynomial
Class PSplineBody

java.lang.Object
  |
  +--ru.sscc.spline.polynomial.PSplineBody

public class PSplineBody

extends java.lang.Object

implements SplineBody

The implementation of spline body interface for 1D polynomial spline having full polynomial representation in mesh nodes.

See Also:

Serialized Form

Field Summary

int	extraCount A number of coefficients used for extrapolation.
int	interCount A number of coefficients used for interpolation.
protected SimpleMesh	mesh Mesh used for calculations.

Fields inherited from interface ru.sscc.spline.SplineBody

DERIVATIVE_OUT_OF_RANGE, ONE_D_NONSUPPORTED, POINT_OUT_OF_RANGE

Constructor Summary

PSplineBody(SimpleMesh mesh, int interDegree, int extraDegree)
Constructor.

Method Summary

double	calculate(SplineWorkspace workspace) Calculates a spline or derivative value at a required point.
void	calculateDefect(int i, RealPointer data, RealPointer defect) Calculate defect of polynomial spline at i-th mesh node.
SplineWorkspace	createWorkspace(RealPointer data) Creates a workspace required for a spline value and derivatives calculation.
int	dimension() Returns a spline dimension (1 in this case).
SimpleMesh	getMesh() Returns the mesh.
int	getVectorLength() Returns a full number of coefficients in the spline representation.
int	maxQuote() Returns a maximal number of spline coefficients simultaneously needed in a spline value or its partial derivatives calculation (interCount in this case).
void	prepareWorkspace(SplineWorkspace workspace, double point, int index, int count) Prepares a workspace for an 1D spline derivative calculation at a point required.
void	prepareWorkspace(SplineWorkspace workspace, RealPointer point, int count) Prepares a workspace for a spline calculation at a point required.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

interCount

public final int interCount

A number of coefficients used for interpolation.

extraCount

public final int extraCount

A number of coefficients used for extrapolation.

mesh

protected SimpleMesh mesh

Mesh used for calculations.

Constructor Detail

PSplineBody

public PSplineBody(SimpleMesh mesh,
                   int interDegree,
                   int extraDegree)

Constructor.

Parameters:

mesh - a mesh of nodes

interDegree - a degree of polynomials between mesh nodes

extraDegree - a degree of polynomials outside mesh interval

Method Detail

dimension

public int dimension()

Returns a spline dimension (1 in this case).

Specified by:

dimension in interface SplineBody

getVectorLength

public int getVectorLength()

Returns a full number of coefficients in the spline representation.

Specified by:

getVectorLength in interface SplineBody

maxQuote

public int maxQuote()

Returns a maximal number of spline coefficients simultaneously needed in a spline value or its partial derivatives calculation (interCount in this case).

Specified by:

maxQuote in interface SplineBody

createWorkspace

public SplineWorkspace createWorkspace(RealPointer data)

Creates a workspace required for a spline value and derivatives calculation.

Specified by:

createWorkspace in interface SplineBody

Parameters:

data - a pointer to associated data vector

prepareWorkspace

public void prepareWorkspace(SplineWorkspace workspace,
                             RealPointer point,
                             int count)

Prepares a workspace for a spline calculation at a point required.

Specified by:

prepareWorkspace in interface SplineBody

Parameters:

workspace - a spline workspace

point - a pointer to the point on the real axis

count - a number of splines will be calculated later

prepareWorkspace

public void prepareWorkspace(SplineWorkspace workspace,
                             double point,
                             int index,
                             int count)

Prepares a workspace for an 1D spline derivative calculation at a point required.

Specified by:

prepareWorkspace in interface SplineBody

Parameters:

workspace - a spline workspace

point - a point on the real axis

index - a derivative index

count - a number of splines will be calculated later

calculate

public double calculate(SplineWorkspace workspace)

Calculates a spline or derivative value at a required point. All information on the derivative and the point should be prepared before by one of the prepareWorkspace methods.

Specified by:

calculate in interface SplineBody

Parameters:

workspace - a spline workspace

Returns:

the spline or derivative value

calculateDefect

public void calculateDefect(int i,
                            RealPointer data,
                            RealPointer defect)

Calculate defect of polynomial spline at i-th mesh node. The defect is the polynomial of (extraCount-1) degree that equals to the difference between the right and left polynomial representations at required mesh node.

Parameters:

i - a node number in the range of [0..mesh.size-1]

data - a pointer to the spline coefficients vector

defect - a pointer to vector for storing the result (the vector must contain at least extraCount entries)

getMesh

public SimpleMesh getMesh()

Returns the mesh.