org.fraid.math
Class MathHelperSampled

java.lang.Object
  org.fraid.math.MathHelperSampled

public class MathHelperSampled
extends java.lang.Object

Nested Class Summary

static class

MathHelperSampled.FFTType

Constructor Summary

MathHelperSampled()

Method Summary

static Samples	abstractFFT(Samples aInputSamples, MathHelperSampled.FFTType aType, int aStartSample, int aLength)
static Complex	approximateY(double aX, Samples aSamples) Approximates the value of a function sampled by n discrete points.
static Samples	createDummySamples(int aDesiredSamplingFrequency)
static int	intervalSearch(double aX, Samples aSamples)
static Samples	trimAndScaleForwardFFT(Samples vFftSamples)

Methods inherited from class java.lang.Object

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

Constructor Detail

MathHelperSampled

public MathHelperSampled()

Method Detail

intervalSearch

public static int intervalSearch(double aX,
                                 Samples aSamples)

Parameters:

aX - the number we are trying to fit into an interval.

aPoints - the x portions don't have to be equally spaced but need to be ordered from smaller to bigger

Returns:

returns the index of the interval where aX belongs, -1 if it is less than the lower boundary of the array, aPoints.length if it is greater than the upper boundary

approximateY

public static Complex approximateY(double aX,
                                   Samples aSamples)
                            throws ComplexFunctionException

Approximates the value of a function sampled by n discrete points.

Parameters:

aX - the point at which we want to approximate;

aPoints - array with the sampled values;

Returns:

the approximated value of the function at point aX

Throws:

java.lang.Exception - if the array contains less than three elements

ComplexFunctionException

abstractFFT

public static Samples abstractFFT(Samples aInputSamples,
                                  MathHelperSampled.FFTType aType,
                                  int aStartSample,
                                  int aLength)
                           throws ComplexFunctionException

Throws:

ComplexFunctionException

trimAndScaleForwardFFT

public static Samples trimAndScaleForwardFFT(Samples vFftSamples)

createDummySamples

public static Samples createDummySamples(int aDesiredSamplingFrequency)