Facemorph
Class Numerical

java.lang.Object
  Facemorph.Numerical

public class Numerical
extends java.lang.Object

Some numberical methods

Field Summary

static float	EPS A threshold value
static float	FPMIN Floating point smallest value
static int	ITMAX Maximum number of iterations

Constructor Summary

Numerical()
Creates a new instance of Numerical

Method Summary

static float	betai(float a, float b, float x) Incomplete beta function
static void	FFT(float[] data, int[] nn, int ndim, int isign) Compute the ndim dimensional FFT
static float	gammaq(float a, float x) Incomplete gamma function
static int	twoFFT(float[] data1, float[] data2, int[] nn, int ndim, int isign) Replace two real arrays with their Fourier Transforms The complex left hand side of the transform is returned only the full transform can be recovered using symmetry

Methods inherited from class java.lang.Object

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

Field Detail

ITMAX

public static final int ITMAX

Maximum number of iterations

See Also:

Constant Field Values

EPS

public static final float EPS

A threshold value

See Also:

Constant Field Values

FPMIN

public static final float FPMIN

Floating point smallest value

See Also:

Constant Field Values

Constructor Detail

Numerical

public Numerical()

Creates a new instance of Numerical

Method Detail

gammaq

public static float gammaq(float a,
                           float x)

Incomplete gamma function

Parameters:

a - parameter a

x - parameter x

Returns:

return the evaluated function

betai

public static float betai(float a,
                          float b,
                          float x)

Incomplete beta function

Parameters:

a - a

b - b

x - x

Returns:

returns the incomplete beta function

FFT

public static void FFT(float[] data,
                       int[] nn,
                       int ndim,
                       int isign)

Compute the ndim dimensional FFT

Parameters:

data - data to FFT

nn - array holding the length of each dimension

ndim - number of dimensions

isign - isign=1 forward FFT, isign=-1 inverse FFT

twoFFT

public static int twoFFT(float[] data1,
                         float[] data2,
                         int[] nn,
                         int ndim,
                         int isign)

Replace two real arrays with their Fourier Transforms The complex left hand side of the transform is returned only the full transform can be recovered using symmetry

Parameters:

data1 - first data array

data2 - second data array

nn - dimensions

ndim - number of dimensions

isign -

Returns:

returns 1