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2-D FFT of a matrix

From: Frederic Devernay
Subject: 2-D FFT of a matrix
Date: Mon, 28 Mar 1994 14:38:47 +0200

what should return fft() when called on a matrix?
octave returns the matrix formed by the ffts of the columns of the
matrix. Shouldn't it return the 2-D fft of the matrix instead?
after all, why does it return the fft of the colums and not of the


P.S: to calculate the 2-d fft of a matrix, one has to compute fft(fft(X)')'

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