How to Plot Smooth psuedo wigner Ville Distribution of multiple signals and save them each in a folder.

Hello Everyone!

I have a total of 89 ECG Signals, for which i have to do time frequency analysis means i have to find the smooth psuedo wigner ville distribution (SPWVD) of all 89 signals. I want to read each signal (one by one), plot their (SPWVD) and save that image into a folder. It means that there are a total of 89 images saved in a folder.

Actually, I am reading each signal, potting their time-frequency transform and then save that image in a folder which is taking too much time. I have also plotted Continous Wavelet Transform (CWT) of these 89 signals for which i uses CWTfilterBank (it loads all signals at once, computes CWT and saves each image to a folder), I cannot find this kind of ease in the former scenario. Can anybody please tell guide me how to find (SPWVD) of all 89 signals (at once or through a loop) and save them in a specific folder?

Answer 1

[Bjorn Gustavsson]

If you can do something like this:

ECG_files = dir('your-data-files.ECG'); % modify to read your data-files...
output_dir = 'WV-plots';                % modify to put this where it fits
mkdir(output_dir)
for iFiles = 1:numel(ECG_files)
  curr_ECG = your_read_ECG_fcn(ECG_files(iFiles).name); % modify...
  cWV = wvd(curr_ECG);                                  % add additional inputs
  your_WV_ecg_plot(cWV)
  filename = sprintf('WV-ECG-%02d.png',iFiles);
  filename = fullfile(output_dir,filename);
  print('-dpng','-painters',filename)
end

Then it should run automatically.

HTH

[Muhammad Asif]

Thankyou @Bjorn Gustavsson! It works good now, I just do some minor changes in your answer.

[Bjorn Gustavsson]

Good, happy that it helped.