Envelope detection in Matlab -

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I am trying to get an envelope for a measured spectrum.

I used the hilbert function in MATLAB which I wrote for a dummy function,

but it does not give the right result for my spectrum is. (I got the right curve back).

I am thinking that the oscillation of my spectrum is very fast, but it is not certain about this.

Hope someone can tell me what is wrong here. 

  A = xlsread ('test.xls'); Y = one (,, 2); H1 = imag (Hilbert (y)); E = sqrt (y ^ 2 + h1 ^ 2 ..);


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