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How the harmonics are located in prettyFFT

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pankaj jha

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Hello all

I am trying to understand the code for the matlab function called "prettyFFT" provided at

https://secure.engr.oregonstate.edu/wiki/ams/index.php/Matlab/PrettyFFT


Can anybody help me understand the section of the code given below:

Code dot - [expand]
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% GET HARMONICS
harm = bin;
t=1;
nyqpts=(pts/2-1);
all_harms = harm:step:(harm*nyqpts);
all_harms = mod(all_harms,pts);
all_harms = (pts-all_harms).*(all_harms>nyqpts) + all_harms.*(all_harms<=nyqpts);
all_harms = all_harms.*(all_harms>0 & all_harms<pts/2) + (all_harms<=0) + (all_harms>=pts/2).*nyqpts;
if (maxh==0 || maxh>length(all_harms))
maxh=length(all_harms);
end
for k=1:maxh
if(dbf2(all_harms(k)) > noise_top)
harm(t) = all_harms(k);
hnum(t) = k;
t=t+1;
end
end
 
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