org.hipparchus.analysis.interpolation

Class FieldHermiteInterpolator<T extends FieldElement<T>>

java.lang.Object

org.hipparchus.analysis.interpolation.FieldHermiteInterpolator<T>

Type Parameters:

T - Type of the field elements.

public class FieldHermiteInterpolator<T extends FieldElement<T>>
extends Object

Polynomial interpolator using both sample values and sample derivatives.

The interpolation polynomials match all sample points, including both values and provided derivatives. There is one polynomial for each component of the values vector. All polynomials have the same degree. The degree of the polynomials depends on the number of points and number of derivatives at each point. For example the interpolation polynomials for n sample points without any derivatives all have degree n-1. The interpolation polynomials for n sample points with the two extreme points having value and first derivative and the remaining points having value only all have degree n+1. The interpolation polynomial for n sample points with value, first and second derivative for all points all have degree 3n-1.

Constructor Summary

Constructors

Constructor and Description
FieldHermiteInterpolator() Create an empty interpolator.

Method Summary

Modifier and Type	Method and Description
void	addSamplePoint(T x, T[]... value) Add a sample point.
T[][]	derivatives(T x, int order) Interpolate value and first derivatives at a specified abscissa.
T[]	value(T x) Interpolate value at a specified abscissa.

Methods inherited from class java.lang.Object

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

Constructor Detail

FieldHermiteInterpolator

public FieldHermiteInterpolator()

Create an empty interpolator.

Method Detail

addSamplePoint

@SafeVarargs
public final void addSamplePoint(T x,
                                              T[]... value)
                                       throws MathIllegalArgumentException,
                                              MathRuntimeException,
                                              NullArgumentException

Add a sample point.

This method must be called once for each sample point. It is allowed to mix some calls with values only with calls with values and first derivatives.

The point abscissae for all calls must be different.

Parameters:

x - abscissa of the sample point

value - value and derivatives of the sample point (if only one row is passed, it is the value, if two rows are passed the first one is the value and the second the derivative and so on)

Throws:

MathIllegalArgumentException - if the abscissa difference between added point and a previous point is zero (i.e. the two points are at same abscissa)

MathRuntimeException - if the number of derivatives is larger than 20, which prevents computation of a factorial

MathIllegalArgumentException - if derivative structures are inconsistent

NullArgumentException - if x is null

value

public T[] value(T x)
          throws MathIllegalArgumentException,
                 NullArgumentException

Interpolate value at a specified abscissa.

Parameters:

x - interpolation abscissa

Returns:

interpolated value

Throws:

MathIllegalArgumentException - if sample is empty

NullArgumentException - if x is null

derivatives

public T[][] derivatives(T x,
                         int order)
                  throws MathIllegalArgumentException,
                         NullArgumentException

Interpolate value and first derivatives at a specified abscissa.

Parameters:

x - interpolation abscissa

order - maximum derivation order

Returns:

interpolated value and derivatives (value in row 0, 1^st derivative in row 1, ... n^th derivative in row n)

Throws:

MathIllegalArgumentException - if sample is empty

NullArgumentException - if x is null