org.apache.commons.math3.analysis.interpolation
Class BicubicSplineInterpolator

java.lang.Object
  org.apache.commons.math3.analysis.interpolation.BicubicSplineInterpolator

All Implemented Interfaces:

BivariateGridInterpolator

Direct Known Subclasses:

SmoothingPolynomialBicubicSplineInterpolator

public class BicubicSplineInterpolator
extends Object
implements BivariateGridInterpolator

Generates a bicubic interpolating function.

Since:

2.2

Version:

$Id: BicubicSplineInterpolator.java 1455194 2013-03-11 15:45:54Z luc $

Constructor Summary

BicubicSplineInterpolator()

Method Summary

BicubicSplineInterpolatingFunction	interpolate(double[] xval, double[] yval, double[][] fval) Compute an interpolating function for the dataset.
private int	nextIndex(int i, int max) Computes the next index of an array, clipping if necessary.
private int	previousIndex(int i) Computes the previous index of an array, clipping if necessary.

Methods inherited from class java.lang.Object

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

Constructor Detail

BicubicSplineInterpolator

public BicubicSplineInterpolator()

Method Detail

interpolate

public BicubicSplineInterpolatingFunction interpolate(double[] xval,
                                                      double[] yval,
                                                      double[][] fval)
                                               throws NoDataException,
                                                      DimensionMismatchException,
                                                      NonMonotonicSequenceException,
                                                      NumberIsTooSmallException

Compute an interpolating function for the dataset.

Specified by:

interpolate in interface BivariateGridInterpolator

Parameters:

xval - All the x-coordinates of the interpolation points, sorted in increasing order.

yval - All the y-coordinates of the interpolation points, sorted in increasing order.

fval - The values of the interpolation points on all the grid knots: fval[i][j] = f(xval[i], yval[j]).

Returns:

a function which interpolates the dataset.

Throws:

NoDataException - if any of the arrays has zero length.

DimensionMismatchException - if the array lengths are inconsistent.

NonMonotonicSequenceException - if the array is not sorted.

NumberIsTooSmallException - if the number of points is too small for the order of the interpolation

nextIndex

private int nextIndex(int i,
                      int max)

Computes the next index of an array, clipping if necessary. It is assumed (but not checked) that i >= 0.

Parameters:

i - Index.

max - Upper limit of the array.

Returns:

the next index.

previousIndex

private int previousIndex(int i)

Computes the previous index of an array, clipping if necessary. It is assumed (but not checked) that i is smaller than the size of the array.

Parameters:

i - Index.

Returns:

the previous index.