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function res = fft21 (A, m, n)
//Calculates the two-dimensional discrete Fourier transform of A using a Fast Fourier Transform algorithm.
//Calling Sequence
//fft2 (A, m, n)
//fft2 (A)
//Parameters
//A: input matrix
//m: number of rows of A to be used
//n: number of columns of A to be used
//Description
//This is an Octave function.
//It performs two-dimentional FFT on the matrix A. m and n may be used specify the number of rows and columns of A to use. If either of these is larger than the size of A, A is resized and padded with zeros.
//If A is a multi-dimensional matrix, each two-dimensional sub-matrix of A is treated separately.
//Examples
//x = [1 2 3; 4 5 6; 7 8 9]
//m = 4
//n = 4
//fft21 (A, m, n)
//ans =
//
// 45 + 0i -6 - 15i 15 + 0i -6 + 15i
// -18 - 15i -5 + 8i -6 - 5i 5 - 4i
// 15 + 0i -2 - 5i 5 + 0i -2 + 5i
// -18 + 15i 5 + 4i -6 + 5i -5 - 8i
funcprot(0);
lhs = argn(1)
rhs = argn(2)
if (rhs < 1 | rhs > 3)
error("Wrong number of input arguments.")
end
select(rhs)
case 1 then
res = callOctave("fft2", A)
case 2 then
error("Wrong number of input arguments.")
case 3 then
res = callOctave("fft2", A, m, n)
end
endfunction
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