sim command says there are syntax errors in the MDL, but running MDL within Simulink works

Question

Sahil 2023-1-31

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https://ww2.mathworks.cn/matlabcentral/answers/1904145-sim-command-says-there-are-syntax-errors-in-the-mdl-but-running-mdl-within-simulink-works

回答： Sarthak 2023-3-24

Hi,

I have a working MDL file that compiles and runs within Simulink, but when I call the model using the sim command I am recieving the following error:-

Error using runFAST

Error due to multiple causes.

Caused by:

Error using runFAST

The expression: u(strmatch('Azimuth',OutList))

in 'ROSCO/Cyclic Pitch controller/extract Azimuth'

has a syntax error

Error using runFAST

The expression: u(strmatch('BldPitch1',OutList))

in 'ROSCO/Extract Signals/Extract BldPitch1'

has a syntax error

The offending block is of type Fcn. I tried commenting out those blocks, but the same error arrives referencing a different (similar) block.

Why would the MDL work in simulink, but not with the sim command?

Matlab version is 2022b and OS is Windows 10 64 bit

Thanks,

Sahil

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Abhishek 2023-3-21

Can you provide the MDL file?

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Answer 1

Sarthak 2023-3-24

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1904145-sim-command-says-there-are-syntax-errors-in-the-mdl-but-running-mdl-within-simulink-works#answer_1200129

Hi Sahil,

As per my understanding, it is difficult to find the accurate reason for your error without the model in which the error is occurring. However, there may be a few reasons you are getting errors.

One likely reason could be that Simulink model is using such variables or functions that are not defined in the MATLAB workspace. When you run a model in Simulink it automatically generates the required variables, however that is not the case with the sim command.
It is also possible there are missing or incorrect model parameters or input data or a version mismatch between the MATLAB version and the Simulink version you are using.