Figure(2) is getting replaced by figure(1) and figure(3) by figure(2) in a for loop and so on.

In general, if there is a for loop running from i=1...L for a plot like below

L=5;

for i=1:L
    .
    .
    figure(i)
    plot()
    .
    .
end

There are 5 different windows that open with titles figure(1), figure(2) ... figure(5) that open and plot different stuff according to the parameters given in the plot.

However in one code of mine shown below, this is not happening

L=5;

figure(1);
plot();

for l=2:L
    
    [g,G]=my_own_function1();
    
    figure(l);
    w=[];
    subplot(2,1,1);
    plot(w,G);
    
    figure(l);
    [g2,G2] = my_own_function2();
    w=[];
    subplot(2,1,2);
    plot(w,G2);
end

In this code, figure(1) is getting replaced by figure(2) and figure(2) is getting replaced by figure(3) and so on.. Can somebody tell me why different windows are not opening for this code?

Answer 1

[Guillaume]

As explained in the documentation of figure, when you specify a number in the figure call, "MATLAB searches for an existing figure in which the Number property is equal to n", so possibly your code has changed the Number property of the figures.

In any case, the best way to ensure you're targeting the correct figure is to keep around the figure handles of the figures you've created and explicitly pass these handles to all graphics function. You're then guaranteed that your plot appears on the correct figure, even if some other code or the user happens to change the correct figure.

hfig = figure;
%...
plot(axes(hfig), ...);  %guaranteed to plot in hfig even if its number has changed and whether or not it's the current figure

[Anant Bhushan Nagabhushana]

Tried what you said. Same problem is happening...

What is actually happening is that the axes of the five figures are now getting overlapped but only a single plot (the last one) is appearing. Rest of them are not. Five new windows with different plots are still not opening..

Image attached to show how the Figure Window is actually appearing..

[Anant Bhushan Nagabhushana]

Also, in the previous instance the figure would be named figure(5) for the last figure. Now it is named figure(1). That's the only difference...

[Guillaume]

We need to see the exact code that you're using. There is no way that a plot will appear on a different figure/axes if you pass the correct axes/figure handle (not number) to the plot command.

[Anant Bhushan Nagabhushana]

The Full Code:

%% Common Initialzations

Fs = 61.44;
TrBand = 0.4;
Rs = 45;
Rp = 1;

%% Plotting H -- The desired plot


FbH = [10 15]; % The lower and higher cutoff frequencies

[h,H]=BPFbaseband_func(FbH,Fs,TrBand,Rs,Rp);


figure(1);
w = (-Fs/2:Fs/1024:(Fs/2)-(Fs/1024));
plot(w,20*log10(abs(H)));



%%


L=5;

for l=2:L
    
    disp('l just inside for loop='); disp(l);  
    
    FbG = [10*l 15*l];
    
    w = (-Fs/2:Fs/1024:(Fs/2)-(Fs/1024));
    
    [g,G]=BPFbaseband_func(FbG,Fs,TrBand,Rs,Rp);
    
    [g2,G2] = h_interpolated(g,l);  %My own function. 
    
    disp('l just before plotting='); disp(l);
    
    %figure(l);
    
    hfig=figure;
    
     subplot(2,1,1)
     plot(axes(hfig),w,20*log10(abs(G)));
    
        
     subplot(2,1,2)
     plot(axes(hfig),w,20*log10(abs(G2)));
   
end

[Anant Bhushan Nagabhushana]

What is happening is that figure(1), figure(2), figure(3).. figure(5) are getting plotted but on the same window...