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I'm getting the eigenvalues of a randomly generated hermitian matrix distributed like a normal probabilistic distribution(crowded in the middle values ) but my sir told me that it should be a semicircle , not a bell shaped one.

(not enough rep to upload the plot image, sorry)

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    You can upload the image to imgur.com, post a link to the image, and somebody else can attach it for you...2012-05-05

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I think you were told wrong. The values should indeed approach the semicircle law, but only when the size goes to infinity (and I think that you need some control on the variance of the entries, but I don't really recall that now).

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    this graph is for a 5000x5000 matrix http://mathworld.wolfram.com/WignersSemicircleLaw.html2012-05-05