CODEWITHSUNDEEP
matlabsorting
user466534
user466534

Reputation:

how find indexes of sorted data in the original array?

let us consider following code

>> B=xlsread('data_generations1','A1','g8:g301');
>> [pxx,f]=periodogram(B,[],[],100);
>> [peaks,location]=findpeaks(pxx);
>> [sorted_peaks,i]=sort(peaks,'descend');
>> stem(sorted_peaks)
>> plot(location,peaks)
>> plot(f,pxx)
>>

my aim is that also arrange frequencies according to sorted peaks, i have sorted it descending,so my goal that at first place should be frequencies at which maximum of sorted_peak is occurred and so on,so how can i manage it?thanks in advance

EDITED: is that correct way?

>> freq=f(location);
>> freq(i)

Upvotes: 0

Views: 100

Answers (2)

Clemens
Clemens

Reputation: 245

As far as I understood, 

location(i)

would give you the sorted order of the matching peaks.

So 

sorted_locations = locations(i)
plot(sorted_locations, sorted_peaks)

would give you the matching plot.

Upvotes: 1

Rody Oldenhuis
Rody Oldenhuis

Reputation: 38032

As far as I can see, your edit would indeed be the correct way: 

>> freq_peaks        = f(location);
>> sorted_freq_peaks = freq_peaks (i);

Upvotes: 1

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