# 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.

• ## Method Summary

Modifier and Type
Method
Description
double[]
transform(double[] f, TransformType type)
Returns the (forward, inverse) transform of the specified real data set.
double[]
transform(UnivariateFunction f, double min, double max, int n, TransformType type)
Returns the (forward, inverse) transform of the specified real function, sampled on the specified interval.
• ## Method Details

• ### transform

double[] transform(double[] f, TransformType type) throws MathIllegalArgumentException
Returns the (forward, inverse) transform of the specified real data set.
Parameters:
f - the real data array to be transformed (signal)
type - the type of transform (forward, inverse) to be performed
Returns:
the real transformed array (spectrum)
Throws:
MathIllegalArgumentException - if the array cannot be transformed with the given type (this may be for example due to array size, which is constrained in some transforms)
• ### transform

double[] transform(UnivariateFunction f, double min, double max, int n, TransformType type) throws MathIllegalArgumentException
Returns the (forward, inverse) transform of the specified real function, sampled on the specified interval.
Parameters:
f - the function to be sampled and transformed
min - the (inclusive) lower bound for the interval
max - the (exclusive) upper bound for the interval
n - the number of sample points
type - the type of transform (forward, inverse) to be performed
Returns:
the real transformed array
Throws:
MathIllegalArgumentException - if the lower bound is greater than, or equal to the upper bound
MathIllegalArgumentException - if the number of sample points is negative
MathIllegalArgumentException - if the sample cannot be transformed with the given type (this may be for example due to sample size, which is constrained in some transforms)