Shift zero-frequency component of discrete Fourier transform to center of spectrum
Due to the fact that strings or not considered in the same way in Matlab and in Scilab, results are not equal if A is a string matrix or vector in fftshift(A) or fftshift(A,dim). mtlb_fftshift can emulate this particularity in Scilab.
In Matlab, dim can be greater than the number of dimensions of A but in Scilab you get an error message in this case. mtlb_fftshift can emulate this particularity in Scilab.
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