Display spectrogram on axes GUI [before 2017b version]

Question

Miguel Andrade 2018-5-23

1
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/402205-display-spectrogram-on-axes-gui-before-2017b-version

回答： Giacomo Echevers 2018-6-20

Hi, I'm having compatibility problems regarding the spectrogram function when displaying it on a GUI file axes. With the code below it runs well on 2017b. But in R2017a it throws the following error:

Struct contents reference from a non-struct array object.
Error in pspectrogram>displayspectrogram (line 179)
if strcmp(hRotate.State,'off')
Error in pspectrogram (line 86)
    displayspectrogram(t,f,P,isnormfreq,faxisloc,esttype,threshold);
Error in spectrogram (line 168)
  pspectrogram({x},'spect',varargin{:});
Error in testResults>testResults_OpeningFcn (line 83)
axes(handles.axes5); spectrogram(Y,[], [], [], fs);

Im using the code below:

axes(handles.axes5); spectrogram(Y,[], [], [], fs);

where fs is the sampling frequency and Y signal that i want to analyze.

It's supposed to be like this [Picture using R2017b];

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Answer 1

Giacomo Echevers 2018-6-20

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/402205-display-spectrogram-on-axes-gui-before-2017b-version#answer_325403

在 MATLAB Online 中打开

After a long struggle trying to figure out how to solve this, I believe I've understood what's the issue here.

This particular error:

 Struct contents reference from a non-struct array object.
 Error in pspectrogram>displayspectrogram (line 179)
 if strcmp(hRotate.State,'off')

Is trying to tell us that the structure hRotate isn't actually a structure or maybe it is empty. As a matter of fact, the latter option is what I believe is happening. The structure hRotate refers to the "Rotate 3D" Toolbar option in a regular figure, which is apparently necessary to perform a spectrogram using said function. So what I think might be the solution is to include that toolbar option in your GUI and that should solve the problem.

Cheers.