Display spectrogram on axes GUI [before 2017b version]

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Miguel Andrade
Miguel Andrade 2018-5-23
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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回答（1 个）

Giacomo Echevers
Giacomo Echevers 2018-6-20
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.

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