Simulink System Object forces hardcoded size for reshape function.

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Eduardo Flores 2020-12-31

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https://ww2.mathworks.cn/matlabcentral/answers/706093-simulink-system-object-forces-hardcoded-size-for-reshape-function

编辑： Uday Pradhan 2021-1-5

I'm trying to implement a SRRC filter and simlink throws the common unknown size for right hand at the reshape function when output_size is a precomputed constant. I have to explictly write the number (e.g 21600) for it to work. Why? How is it properly done?

%% Common functions

function setupImpl(obj, ~)

% Perform one-time calculations, such as computing constants

obj.output_size = [obj.l*obj.interpolation_factor 1];

end

function tx_filtered = stepImpl(obj, x, coefficients)

%output_size = obj.l*obj.interpolation_factor;

i_tx_tmp = repmat(real(x), 1, obj.interpolation_factor); % Upsampling

i_tx_interpol = reshape(i_tx_tmp', obj.output_size);

....

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Uday Pradhan 2021-1-5

编辑：Uday Pradhan 2021-1-5

Hi Eduardo,

May be you could share your code so that we can debug it on our end? Or at the very least attach a screenshot of the entire error that you are facing. That way you can get better responses. Thanks!

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