Store Values from a Power Spectrum graph to an array

2011 10 6
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Hi,
I have a power spectrum of a wave signal, and I need to store the power values for the frequencies from 0 - 500 Hz. When I do find(f<500) it shows me the first and the last column number where the power values are. but I need to Store those power values from the frequencies 0-500Hz in an different array since I need to use those values in a formula to integrate a function. If any one can helo me out I am really greatful.
Thanks

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Honglei Chen
Honglei Chen 2011-10-6

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Hi RMIT,
let's say you have the frequency in f and the corresponding spectrum in P. Then you should be able to do what you want by
P0to500 = P((f>0)&(f<500))
HTH

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