Package 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
    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 Details

    • transform

      double[] transform(double[] f) throws IllegalArgumentException
      Transform the given real data set.
      Parameters:
      f - the real data array to be transformed (signal)
      Returns:
      the real transformed array (spectrum)
      Throws:
      IllegalArgumentException - if any parameters are invalid

    • transform

      double[] transform(UnivariateRealFunction f, double min, double max, int n) throws FunctionEvaluationException, 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
      IllegalArgumentException - if any parameters are invalid

    • inversetransform

      double[] inversetransform(double[] f) throws 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:
      IllegalArgumentException - if any parameters are invalid

    • inversetransform

      double[] inversetransform(UnivariateRealFunction f, double min, double max, int n) throws FunctionEvaluationException, 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
      IllegalArgumentException - if any parameters are invalid