The discrete Fourier transform (DFT) matrix for a given dimension n is calculated.
Dimension for the DFT matrix.
The DFT matrix can be used for computing the discrete Fourier transform of
a matrix or vector.
dftMatrix(n) %*% testMatrix is the same as
apply(testMatrix, MARGIN = 2, FUN = fft).
The n-by-n DFT matrix.
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