How to subplot a graph returned by MATLAB function for which there is no option to take the figure handle as input nor can it return a handle as output?

Question

Hari Prasanth 2018-4-6

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https://ww2.mathworks.cn/matlabcentral/answers/393107-how-to-subplot-a-graph-returned-by-matlab-function-for-which-there-is-no-option-to-take-the-figure-h

回答： Jan Rusz 2021-2-16

I would like to plot the output of cwt() to a subplot so that I can compare the result with other graphs next to each other. However, to the best of my understanding, cwt() doesn't take handles as input for me to pass a subplot handle. Nor does it return any handle. I tried a couple of approaches without much success. Ideally, I would like the approach to work something like:

Fs=100;   t=0:1/Fs:10;   y=sin(t);       %create a simple sinusoidal signal
figure;
subplot(2,1,1);plot(t,Fs)          %plot the sinusoidal signal in suplot 211
subplot(2,1,2);cwt(signal,Fs);     %plot the output of cwt() in subplot of 212

But, that doesn't work. cwt() merely replaces the subplots and simply plots like normal.

I have tried other approaches such as copyobj():

figure(1); cwt(signal,Fs); ax1=gca
ax2=figure(2);
copyobj(ax1,ax2);

This works well in copying the figure from figure 1 to figure 2, but when i try a similar approach to copy figure 1 to subplot in figure 2, it fails giving me the error "Axes cannot be a child of Axes". Below the corresponding code:

figure(1); cwt(signal,Fs); ax1=gca
figure(2);ax2=subplot(2,1,1);
copyobj(ax1,ax2);

Any help?

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Walter Roberson 2018-4-9

cwt() without an output will always clear the complete current figure.

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Answer 1

Prajit T R 2018-4-9

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/393107-how-to-subplot-a-graph-returned-by-matlab-function-for-which-there-is-no-option-to-take-the-figure-h#answer_314139

Hi Hari

Check out this link: https://www.mathworks.com/matlabcentral/answers/30684-wscalogram-and-subplots

Here, cwt is being plotted as a subplot. Hence this should be possible in your case as well. Try to modify the code that you would find on the link to suit your requirement.

Hope this helps.

Cheers