Getting the frequency of all peaks after doing fft

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

Answer 1

[KSSV]

You can achieve the task with ease......sort the frequencies f, in descending order....and pick the first k number of frequencies you want.

[Chris Matthews]

How do you do this? That's the but I'm stuck on.

[KSSV]

f = rand(10,1) ;

%%sort them 
[f_sort,idx] = sort(f,'descend') ;
%%pick the first four
iwant = f_sort(1:4)

Answer 2

[Star Strider]

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.