org.hipparchus.analysis.interpolation

Class PiecewiseBicubicSplineInterpolatingFunction

java.lang.Object

org.hipparchus.analysis.interpolation.PiecewiseBicubicSplineInterpolatingFunction

All Implemented Interfaces:

BivariateFunction, FieldBivariateFunction

public class PiecewiseBicubicSplineInterpolatingFunction
extends Object
implements BivariateFunction, FieldBivariateFunction

Function that implements the bicubic spline interpolation. This implementation currently uses AkimaSplineInterpolator as the underlying one-dimensional interpolator, which requires 5 sample points; insufficient data will raise an exception when the value method is called.

Constructor Summary

Constructors

Constructor and Description
PiecewiseBicubicSplineInterpolatingFunction(double[] x, double[] y, double[][] f)

Method Summary

Modifier and Type	Method and Description
boolean	isValidPoint(double x, double y) Indicates whether a point is within the interpolation range.
double	value(double x, double y) Compute the value for the function.
<T extends RealFieldElement<T>> T	value(T x, T y) Compute the value for the function.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.hipparchus.analysis.FieldBivariateFunction

toRealFieldBivariateFunction

Constructor Detail

PiecewiseBicubicSplineInterpolatingFunction

public PiecewiseBicubicSplineInterpolatingFunction(double[] x,
                                                   double[] y,
                                                   double[][] f)
                                            throws MathIllegalArgumentException,
                                                   NullArgumentException

Parameters:

x - Sample values of the x-coordinate, in increasing order.

y - Sample values of the y-coordinate, in increasing order.

f - Values of the function on every grid point. the expected number of elements.

Throws:

MathIllegalArgumentException - if x or y are not strictly increasing.

NullArgumentException - if any of the arguments are null

MathIllegalArgumentException - if any of the arrays has zero length.

MathIllegalArgumentException - if the length of x and y don't match the row, column height of f

Method Detail

value

public double value(double x,
                    double y)
             throws MathIllegalArgumentException

Compute the value for the function.

Specified by:

value in interface BivariateFunction

Parameters:

x - Abscissa for which the function value should be computed.

y - Ordinate for which the function value should be computed.

Returns:

the value.

Throws:

MathIllegalArgumentException

value

public <T extends RealFieldElement<T>> T value(T x,
                                               T y)
                                        throws MathIllegalArgumentException

Compute the value for the function.

Specified by:

value in interface FieldBivariateFunction

Type Parameters:

T - type of the field elements

Parameters:

x - Abscissa for which the function value should be computed.

y - Ordinate for which the function value should be computed.

Returns:

the value.

Throws:

MathIllegalArgumentException

Since:

1.5

isValidPoint

public boolean isValidPoint(double x,
                            double y)

Indicates whether a point is within the interpolation range.

Parameters:

x - First coordinate.

y - Second coordinate.

Returns:

true if (x, y) is a valid point.