6.14 Other Array Operations

6.14Other Array Operations🔗 i

6.14.1Fast Fourier Transform🔗 i

Wikipedia: Discrete Fourier Transform

procedure
( array-axis-fft arrk)→(Array Float-Complex )
arr:(Array Number )
k:Integer

Performs a discrete Fourier transform on axis k of arr. The length of k must be an integer power of two. (See power-of-two? .) The scaling convention is determined by the parameter dft-convention , which defaults to the convention used in signal processing.

The transform is done in parallel using max-math-threads threads.

procedure
( array-axis-inverse-fft arrk)→(Array Float-Complex )
arr:(Array Number )
k:Integer

The inverse of array-axis-fft , performed by parameterizing the forward transform on (dft-inverse-convention ).

procedure
( array-fft arr)→FCArray
arr:(Array Number )

Performs a discrete Fourier transform on each axis of arr using array-axis-fft .

procedure
( array-inverse-fft arr)→FCArray
arr:(Array Number )

The inverse of array-fft , performed by parameterizing the forward transform on (dft-inverse-convention ).

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