several for loop plots

Hello all,

I am writing a code with several for loops and within each for loop I have several plots. However, my plots generated by these three for loops get overwritten. I would appreciate any help.

Here is the part of my code that I do the plots:

for i= 1:length(rts)

      [IR,fs] = audioread(strjoin([inPath,allWavs(i)],'\'));
      lIR = IR(:,1);

      figure()
      plot(t,rIR_SPL); xlabel('Seconds'); ylabel('Amplitude'); title('Right channel IR');
      legend(rts{1:i});
      grid();
      hold on; 

      figure()
      plot(t,lIR_SPL); xlabel('Seconds'); ylabel('Amplitude'); title('Left channel IR');
      legend(rts{1:i});
      grid();
      hold on;
  end

for i= 1:length(rts)

      [IR,fs] = audioread(strjoin([inPath,allWavs(i)],'\'));

      lIR = IR(:,1);% Speaker pos = -90
      lY = fft(lIR,length(lIR));

      freq = fs/2*linspace(0,1,length(rIR)/2+1);% Frequency data

      figure()
      subplot(4,2,i)
      plot(freq,abs(rY(1:length(rIR)/2+1))); xlabel('Frequency'); ylabel('Amplitude');title('Right channel');
      hold on
      grid();

      figure()
      subplot(4,2,i)
      plot(freq,abs(lY(1:length(lIR)/2+1))); xlabel('Frequency'); ylabel('Amplitude');title('Left channel');
      hold on
      grid();
  end 

for i= 1:length(rts)

      [IR,fs] = audioread(strjoin([inPath,allWavs(i)],'\'));

      lIR = IR(:,1);% Speaker pos = -90
      rIR = IR(:,2);% Speaker pos = +90

      sigt = length(rIR)/fs;% Calculates the total duration of the audio file
      dt = 1/fs;% Bandwidth
      t = 0:dt:(length(rIR)*dt)-dt;% Time data

      figure(i)
  %   spectrogram(rIR,dt,length(rIR),fs)
      spectrogram(rIR)

end

Answer 1

[Geoff Hayes]

Maryam - on each iteration of your for loops you seem to be calling

 figure()

at least twice. This will create a new figure and so each plot will be on that new figure...instead of each plot (or subplot) being on the same figure.

If you want each of your three for loops to have its own figure, then remove the calls to

 figure()

from within your for loops and call it once outside of your loop like

 figure();
 for i= 1:length(rts)
     % etc.
 end

If you want one figure for all plots from all iterations of all for loops, then just call figure() once.

[Maryam Landi]

Thanks for the answer. However, I have two plots in my first two for loops and if I use this:

 figure();
 for i= 1:length(rts)
     % etc.
 end

, then those two plots get overwritten. Any idea?

[Geoff Hayes]

and you have the hold on? also, please clarify what you mean by overwritten. Do the first two plots get overwritten on subsequent iterations of the loop? Or the second plot overwrite the first? Please show your updated code.