| Extracted from Pike v7.8 release 866 at 2016-04-05.

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Math
Math.Transforms
Math.Transforms.FFT

# Method Math.Transforms.FFT()->rIFFT()

Method rIFFT

  `array(float) rIFFT(array(array(float)) input)`

Description

  Returns the inverse FFT of the input array. The input must be complex and guaranteed to generate a real output.

  The input is an array. It's first element is the amplitudes and the second element is the phases.

  The output is an array of the real values for the iFFT.

Parameter `real_input`

  The array of floats and/or ints to transform.

Note

  rIFFT(rFFT()) returns the input array scaled by n=sizeof(input array). This is due to the nature of the DFT algorithm.

See also

  rFFT()