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FFT
Perform Fourier transform on complex array
FFT OutputRealPartArray,OutputImaginaryPartArray,InputRealPartArray,InputImaginaryPartArray[,WindowFunctionValueArray] 
・All specified arrays must have the same number of elements, and the number of elements must be 2 to the power of n.
・The output and input arrangement may be the same.
Arguments
OutputRealPartArray,OutputImaginaryPartArray
Complex array of real and imaginary parts containing the result of the operation
InputRealPartArray,InputImaginaryPartArray
Complex array of real and imaginary parts to operate on
WindowFunctionValueArray
Array containing the window function values
・If specified, the input complex number array is multiplied by the element value of the same index, and then the Fourier transform is performed.
・The window function value array can also be obtained with the FFTTWFN command.
Example
DIM iR[1024],iI[1024],WF[1024]
DIM oR[1024],oI[1024]
FFTWFN WF,3
FFT oR,oI,iR,iI,WF
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June 3, 2020
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