Question

I have found a bit of code in MATLAB:

y = fft(y, nfft);

Where y is a 512×443 two-dimensional array and nfft = 512.

I thought that fft is for a one-dimensional array and for a two-dimensional array there should be fft2, but fft is working. How is that possible?

Answer 1

From the documentation (emphasis mine):

Y = fft(x) returns the discrete Fourier transform (DFT) of vector x, computed with a fast Fourier transform (FFT) algorithm.

If the input X is a matrix, Y = fft(X) returns the Fourier transform of each column of the matrix.