Simulink running despite error message

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Marko Marković
Marko Marković 2024-8-17
评论： Marko Marković 2024-9-2
So, I have the following issue, that confuses me. I have simulink model to compare different controller (in Variant Subsystems). I use mainly MATLAB Function Blocks to implement those controllers. For one controller, however, simulink throws me an error message:
This is the only error message and it doesn't make sense to me. But the simulation completes normally, and all the values seem correct. I could also set breakpoints and check on the matrix dimensions:
I am wondering if anybody had same issue and what causes it? I could just ignore it, but this does not seem right for me. I would rather fix this.
  2 个评论
Walter Roberson
Walter Roberson 2024-8-19
As a matter of form, I would avoid using
r_n = N_x(1)\r;
The \ is seldom used with scalar left operand, so most people will not understand the operation you are doing there, which is equivalent to
r_n = r ./ N_x(1);
Marko Marković
Marko Marković 2024-8-19
编辑：Marko Marković 2024-8-19
Ah, I see. Thank you for the remark!!

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halleyhit
halleyhit 2024-8-19
It seems Simulink can not determine the size of variables in MATLAB Function block. Please try to use "edit data" on top left, and set your intput and output variable size other than -1.
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halleyhit
halleyhit 2024-8-22
With setting size to -1, sometimes MATLAB is able to detemine the size, but sometimes it can not. I have no idea on when the detemination works, but best practice is to set the value strongly.
Marko Marković
Marko Marković 2024-9-2
I see, thank you! I'll stick then with best practices and just set the dimensions.

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