How to setup Simulink logs out .mat format?

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Szabó Bence Károly
Szabó Bence Károly on 24 Jan 2022
Answered: Sayani on 21 Nov 2022
I log a lot of signal in Simulink, with The following setup:
in(i) = in(i).setModelParameter(...
'LoggingToFile', 'On',...
'LoggingFileName', newFileName,...
'SaveFormat', 'Dataset',...
'SaveTime', 'off',...
'SaveState', 'off',...
'SaveOutput', 'off',...
'SaveFinalState', 'off',...
'DSMLogging', 'off',...
'ReturnWorkspaceOutputs', 'on',...
'Profile', 'off',...
'InspectSignalLogs', 'off',...
'DatasetSignalFormat', 'timeseries'...
The version 7.3 .mat size is almost 2-3 times larger than the version 7.0. That is why I would like to create a version 7 .mat, but it seems Simulink will create a 7.3 mat file anyway. (In the preferences > General > Mat-File - 7.0 option is selected but not really matters which one I select.)
If I load the .mat to the matlab workspace and call
data = load('FileFromSimulink.mat');
save('FileFromSimulink.mat', '-v7', '-struct', 'data')
It will create the expected .mat with reduced size. How can I avoid this extra step to load the files then save it.

Answers (2)

Muthukumar Ganesan
Muthukumar Ganesan on 20 Aug 2022
In the newer versions of matlab by default, Simulink creates .mat file with version 7.3
You can add these commands in Model Properties -> Callbacks -> StopFcn
data = load('FileFromSimulink.mat');
save('FileFromSimulink.mat', '-v7', '-struct', 'data');
clear data;

Sayani on 21 Nov 2022
You can avoid this extra step by adding "Callbacks" to your model. "Callbacks" can be accessed through "Model Properties".
In this particular case, you should add your script to change MAT File version in "StopFcn" under "Callbacks" section. This would then generate a v7.0 MAT File for you automatically everytime the model is executed.


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