Error using 'getframe' in an embedded Matlab function in a Simulink Model

Question

Chris 2013-3-6

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https://ww2.mathworks.cn/matlabcentral/answers/66052-error-using-getframe-in-an-embedded-matlab-function-in-a-simulink-model

编辑： Tong Zhao 2021-9-10

I am trying to use 'getframe' in a Matlab function within a Simulink Model. I get the error "Cannot get field colormap from struct colormap. Block Baseband Waterfall Spectrum/MATLAB Function1 (#74) While executing: none "

Now, obviously the 'colormap' field is empty. For some reason when you use 'getframe' within Simulink it is unable to deal with an empty field. Seams to work fine in Matlab. So is this a bug? Is there a way around the problem?

Please see the function code below:

function mycdata  = fcn(v,Myhandle0,count)%#codegen
coder.extrinsic('get'); 
coder.extrinsic('subplot');
coder.extrinsic('getframe');
mymovie = struct('cdata',uint8(zeros(420,560,3)),'colormap',double([]));
figure1 = Myhandle0;
if count >0
    subplot2 = subplot(1,2,2,'Parent',figure1);
    surf(v,'Parent',subplot2,'LineStyle','none');
    mymovie =getframe(figure1);
    mycdata = mymovie.cdata;
    hold off;
else
    mycdata = uint8(zeros(420,560,3));
end
end

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Walter Roberson 2013-3-6

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It probably will not make any difference, but the official syntax for the struct in MATLAB would be

mymovie = struct('cdata', {uint8(zeros(420,560,3))}, 'colormap', {double([])});

and you could probably use zeros(0,0) instead of double([])

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Answer 1

Fred Smith 2013-3-6

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https://ww2.mathworks.cn/matlabcentral/answers/66052-error-using-getframe-in-an-embedded-matlab-function-in-a-simulink-model#answer_77679

I think this is a bug or a limitation depending on what version you are using. Prior to R2012b, empty-fields were not supported by MATLAB Function blocks.

Functionality very similar to this worked fine for me in the latest development version.

What version of MATLAB are you using?