Simulink Matlab system block with timetable error

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gregory pais 2023-12-15

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评论： gregory pais 2024-1-3

In my class derivated from matlab.System I use a timetable property initialized with the function array2timetable from a matrix of size 1460*1441 double elements

I use further this timetable in my code and in Matlab and all run without issue.

But when I use it in Simulink throught a Matlab system object I have this error after ctrl+D

Simulink detected an error 'Unable to determine a common type for all cell elements due to failed loop unrolling.'. The error occurred for MATLAB System block 'test/MATLAB System'. See line 45, column 35 in file 'C:\Program Files\MATLAB\R2022b\toolbox\matlab\datatypes\codegen\tabular\+matlab\+internal\+coder\@tabular\extractData.m'. The error was detected during size propagation phase.

After many test I find this error is due to my timetable exceeds 1100 variables when I create a timetable with an array of 1460*1100 double elements this error is not rised.

How to solve this issue ? any configurations parameters?

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Answer 1

Jaynik 2023-12-29

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Hi Gregory,

I understand that MATLAB code executes without any issue when using 'timetable' but you are encountering an error when integrating the code within Simulink through a MATLAB "System" block.

It is difficult to provide you a specific answer without investigating the actual model. While the code for "timetable" runs without any errors on MATLAB, there are some limitations to it when it comes to Simulink. It is recommended to go through the following documentation which outlines the limitations for code generation with "timetables":

Alternatively, if possible, try reducing the complexity of the timetable by limiting the number of variables or the size of the data. If your application permits, dividing the timetable into smaller segments could be a viable workaround.

Hope this helps!

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gregory pais 2024-1-3

Finaly, due to the size limitations of timetable after compilation phase I used a simple double matrix to store all the datas and I lose the timetable data struct. Thanks

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