Clear Filters
Clear Filters

Graph error with Periodogram, incorrect plotting

1 view (last 30 days)
Mini Me
Mini Me on 20 May 2014
Commented: dpb on 21 May 2014
I have this portion of code, my goal is to have my data go from 1200 x 1 to 300 by 4 and then reshape back into a []x 1 matrix. my problem is when i change the matrix to 300 x 4 then take the periodogram...since my Fs is 5, w for each column is now 0 to 2.5 hz which is fine for a 300 x4 matrix. when i make everything back to [] x 1 matrix, since size of w is 300 x4 it keeps repeating 0 to 2.5 4 times. i want the value for w to be continuous since my FS is 5 for the whole data. the periodogram give me four diff graphs instead of one. here's my code. Help
New_Pxx=[];
New_w=[];
test=Downsampled_data(:);
New_array=reshape(test,(length(test)/length(timerArray)),length(timerArray));
for i=1:4
Fs=5;
[Pxx w]=periodogram(test,[],'onesided',[],Fs);
New_Pxx=[New_Pxx;Pxx];
New_w=[New_w;w]
end
loglog(New_w,New_Pxx);
  10 Comments
Mini Me
Mini Me on 21 May 2014
never mind i fix the problem....Thank you for responding...

Sign in to comment.

Answers (0)

Products

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!