org.apache.commons.math.transform

Interface RealTransformer

All Known Implementing Classes:

FastCosineTransformer, FastHadamardTransformer, FastSineTransformer

public interface RealTransformer

Interface for one-dimensional data sets transformations producing real results.

Such transforms include sine transform, cosine transform or Hadamard transform. Fourier transform is of a different kind and does not implement this interface since it produces complex results instead of real ones.

Since:

2.0

Method Summary

Modifier and Type	Method and Description
double[]	inversetransform(double[] f) Inversely transform the given real data set.
double[]	inversetransform(UnivariateRealFunction f, double min, double max, int n) Inversely transform the given real function, sampled on the given interval.
double[]	transform(double[] f) Transform the given real data set.
double[]	transform(UnivariateRealFunction f, double min, double max, int n) Transform the given real function, sampled on the given interval.

Method Detail

transform

double[] transform(double[] f)
            throws java.lang.IllegalArgumentException

Transform the given real data set.

Parameters:

f - the real data array to be transformed (signal)

Returns:

the real transformed array (spectrum)

Throws:

java.lang.IllegalArgumentException - if any parameters are invalid

transform

double[] transform(UnivariateRealFunction f,
                   double min,
                   double max,
                   int n)
            throws FunctionEvaluationException,
                   java.lang.IllegalArgumentException

Transform the given real function, sampled on the given interval.

Parameters:

f - the function to be sampled and transformed

min - the lower bound for the interval

max - the upper bound for the interval

n - the number of sample points

Returns:

the real transformed array

Throws:

FunctionEvaluationException - if function cannot be evaluated at some point

java.lang.IllegalArgumentException - if any parameters are invalid

inversetransform

double[] inversetransform(double[] f)
                   throws java.lang.IllegalArgumentException

Inversely transform the given real data set.

Parameters:

f - the real data array to be inversely transformed (spectrum)

Returns:

the real inversely transformed array (signal)

Throws:

java.lang.IllegalArgumentException - if any parameters are invalid

inversetransform

double[] inversetransform(UnivariateRealFunction f,
                          double min,
                          double max,
                          int n)
                   throws FunctionEvaluationException,
                          java.lang.IllegalArgumentException

Inversely transform the given real function, sampled on the given interval.

Parameters:

f - the function to be sampled and inversely transformed

min - the lower bound for the interval

max - the upper bound for the interval

n - the number of sample points

Returns:

the real inversely transformed array

Throws:

FunctionEvaluationException - if function cannot be evaluated at some point

java.lang.IllegalArgumentException - if any parameters are invalid