Error: The sample time for any variable-size signal must be discrete

Question

rach 2012-3-3

1
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https://ww2.mathworks.cn/matlabcentral/answers/31069-error-the-sample-time-for-any-variable-size-signal-must-be-discrete

回答： amal elkouche 2019-11-10

Hi,

I have the following code within the MATLAB Function Block Editor (in the Matlab function found in the user-defined library in simulink). The size of output y depends on the input u.

function y = fcn(u)
%#codegen
    assert(u<=10);
    y = zeros(1,u);
    for i = 1:u
       y(i) = 3;
    end
end

Also, in the Ports and Data Manager, I have also checked the Variable Size option for output y, and entered a size of 10 in the Size field.

However, running the simulation generated the error: The signal at input port 1 of 'untitled/Display' is a variable-size signal with a nondiscrete sample time. The sample time for any variable-size signal must be discrete.

May I know what is going on and how do I go about solving it? I would greatly appreciate any help or advice. Thanks in advance!

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Answer 1

S An 2018-4-29

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/31069-error-the-sample-time-for-any-variable-size-signal-must-be-discrete#answer_317776

Hi, I met this problem today. I solved it by creating a new blank "matlab function" in simulink and copying the code from the old one. Hope it's useful!