Getting the frequency of all peaks after doing fft

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Chris Matthews
Chris Matthews 2017-9-27
回答： Star Strider 2017-9-27
Im running a pretty old version of matlab (without the findpeaks function) and want to determine the frequency of all of the peaks in a signal after doing fft.
Any ideas about how to go about this? Ideally, i want to do my fft on a signal, determine the frequency values and spit them out into a table or something.
Thanks for help!
Chris

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回答（2 个）

KSSV
KSSV 2017-9-27
You can achieve the task with ease......sort the frequencies f, in descending order....and pick the first k number of frequencies you want.
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KSSV
KSSV 2017-9-27
f = rand(10,1) ;
%%sort them
[f_sort,idx] = sort(f,'descend') ;
%%pick the first four
iwant = f_sort(1:4)

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Star Strider
Star Strider 2017-9-27
There are several peak-finding algorithms in the File Exchange. Search the File Exchange (link to the search) for one that does what you want.

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