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Class JSci.maths.wavelet.splines.PiecewiseConstant

java.lang.Object
   |
   +----JSci.maths.wavelet.MultiscaleFunction
           |
           +----JSci.maths.wavelet.splines.Spline
                   |
                   +----JSci.maths.wavelet.splines.PiecewiseConstant

public class PiecewiseConstant

extends Spline

implements Filter, Cloneable

filtretype

PiecewiseConstant()

PiecewiseConstant(double[])

clone()

Return a copy of this object

derive()

compute the derivative of the function - useful for numerical analysis

derive(double, double)

compute the derivative of the function - useful for numerical analysis

dimension()

Number of knots

dimension(int)

Number of knots after j iterations

equals(Object)

Check if another object is equal to this PiecewiseConstant object

evaluate(int)

Return as an array the sampled values of the function

getFilterType()

This method is used to compute how the number of scaling functions changes from on scale to the other.

getValue(int)

Get the i th sampled value of the function.

highpass(double[])

This is the implementation of the highpass Filter.

highpass(double[], double[])

This is the implementation of the highpass Filter.

interpolate(int)

Return as an array the interpolated values of the function.

lowpass(double[])

This is the implementation of the lowpass Filter.

lowpass(double[], double[])

This is the implementation of the lowpass Filter.

mass(double, double)

Compute the mass (integral)

previousDimension(int)

This method return the number of "scaling" functions at the previous scale given a number of scaling functions.

setValue(int, double)

Set a particular value

setValues(double[])

Set the sampled values of the function to the specified array

toString()

Return a String representation of the object

 protected static final int filtretype

 public PiecewiseConstant(double v[])

 public PiecewiseConstant()

 public String toString()

Return a String representation of the object

Overrides:

toString in class Spline

 public boolean equals(Object a)

Check if another object is equal to this PiecewiseConstant object

Overrides:

equals in class Spline

 public int getFilterType()

This method is used to compute how the number of scaling functions changes from on scale to the other. Basically, if you have k scaling function and a Filter of type t, you'll have 2*k+t scaling functions at the next scale (dyadic case). Notice that this method assumes that one is working with the dyadic grid while the method "previousDimension" define in the interface "Filter" doesn't.

Overrides:

getFilterType in class Spline

 public int previousDimension(int k)

This method return the number of "scaling" functions at the previous scale given a number of scaling functions. The answer is always smaller than the provided value (about half since this is a dyadic implementation). This relates to the same idea as the "Filter type". It is used by the interface "Filter".

 public double[] lowpass(double v[],
                         double param[])

This is the implementation of the lowpass Filter. It is used by the interface "Filter". Lowpass filters are normalized so that they preserve constants away from the boundaries.

 public double[] highpass(double v[],
                          double param[])

This is the implementation of the highpass Filter. It is used by the interface "Filter". This class doesn't have a highpass Filter so that this method is only provided to be compatible with the interface.

 public double[] lowpass(double gete[])

This is the implementation of the lowpass Filter. It is used by the interface "Filter". Lowpass filters are normalized so that they preserve constants away from the boundaries.

 public double[] highpass(double gete[])

This is the implementation of the highpass Filter. It is used by the interface "Filter". This class doesn't have a highpass Filter so that this method is only provided to be compatible with the interface.

 public Object clone()

Return a copy of this object

Overrides:

clone in class Spline

 public double getValue(int i)

Get the i th sampled value of the function.

Parameters:

i - position (knot)

Throws: IllegalArgumentException

if i is not a within 0 and the last knot (dimension()-1)

 public void setValues(double v[])

Set the sampled values of the function to the specified array

 public double mass(double a,
                    double b)

Compute the mass (integral)

Parameters:

a - left boundary of the interval

b - right boundary of the interval

 public void setValue(int i,
                      double d)

Set a particular value

Parameters:

i - position (knot)

d - value

Throws: IllegalArgumentException

if the parameter i is negative

 public SumOfDiracs derive()

compute the derivative of the function - useful for numerical analysis

 public SumOfDiracs derive(double a,
                           double b)

compute the derivative of the function - useful for numerical analysis

Parameters:

a - left boundary of the interval

b - right boundary of the interval

 public int dimension()

Number of knots

Overrides:

dimension in class Spline

 public int dimension(int j)

Number of knots after j iterations

Parameters:

j - number of iterations

Overrides:

dimension in class Spline

 public double[] interpolate(int j)

Return as an array the interpolated values of the function. Will return the same values as the evaluate method because the Filter is interpolatory.

Parameters:

j - number of iterations

Overrides:

interpolate in class Spline

 public double[] evaluate(int jfin)

Return as an array the sampled values of the function

Parameters:

j - number of iterations

Overrides:

evaluate in class Spline

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