Error due to variable size input in R2022a but model works fine in R2020a

Question

Amrita Ojha 2022-9-28

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1813605-error-due-to-variable-size-input-in-r2022a-but-model-works-fine-in-r2020a

移动：Remo Pillat 2024-5-23

I get the following error when i try to run the model that has already been tried and tested in a different MATLAB version (R2020a):

'Input signal at port 6 for "CarlaRosMatlab_LaneDetection/MATLAB System1" is a variable-size signal, but System object "LaneDetection" indicates that it expects a fixed-size input signal. Connect the input port to a fixed-size signal, or add/modify the 'isInputSizeMutableImpl' method to allow variable-size input signal'

I am using version R2022a. Since no changes have been made to the model and source code, i cannot figure out the issue. Is version mismatch causing this?

I would appreciate any help on this.

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Answer 1

Jagadeesh Konakalla 2022-9-30

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https://ww2.mathworks.cn/matlabcentral/answers/1813605-error-due-to-variable-size-input-in-r2022a-but-model-works-fine-in-r2020a#answer_1462506

移动：Remo Pillat 2024-5-23

Hi Amrita,

From R2020b release onwards, the backend is changed to C++ from Java for better performance. Ths may be the reason for the issue that you observe.

Please see the following link for working with variable size signals in ROS.

Manage Array Sizes for ROS Messages in Simulink - MATLAB & Simulink (mathworks.com)

Please share the model to reproduce the issue on your end. I would suggest you to contact us through the MathWorks Technical support as we may require more data to debug the issue.

Thanks,

Jagadeesh K.