## org.apache.commons.math3.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
Version:
\$Id: RealTransformer.java 1385310 2012-09-16 16:32:10Z tn \$

Method Summary
` 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 Detail

### 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 NonMonotonicSequenceException,
NotStrictlyPositiveException,
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:
`NonMonotonicSequenceException` - if the lower bound is greater than, or equal to the upper bound
`NotStrictlyPositiveException` - 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)

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