Finding Autocorrelation and PSD for a random matrix of 50x50

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Plato A
Plato A on 12 Aug 2015
tempvar = xcorr2(v,v);
[size_1 size_2] = size(tempvar);
size_1 = (size_1 + 1)/2 - 1;
R = (toeplitz(tempvar(size_1+1 : 2*size_1+1)))./size_1;
psd=abs(fftshift(fft(R)));
I like to know whats wrong.Because by theory, I should get a constant value for PSD. But I am getting varying values from 0.02 to 3.2

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