Save an output each simulation

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Sergio Rueda
Sergio Rueda on 30 Jul 2019
Edited: Sergio Rueda on 1 Aug 2019
Hi, I built a model in simulink, wich is feed with a variable input using this code:
mdl = 'PSDfaulty';
x = [0.8:0.01:0.95];
for i = 1:numel(x)
set_param([mdl '/FrontFault'] , 'Value' , num2str(x(i)));
simout = sim(mdl);
end
and it works perfectly, now I need to save in the workspace the output of the model for each simulation, if possible by modifying the code. Im using a simout block but it only saves the last value, Any advice? Thanks.
  6 Comments
Walter Roberson
Walter Roberson on 31 Jul 2019
I am not certain but I suspect that you will need 3 outputs from the sim() command and that all of the interesting values are muxed together in the third output. However at the moment I am not sure what datatype that third output would be or how the values would be arranged for it.
Sergio Rueda
Sergio Rueda on 31 Jul 2019
Ah OK I understand. If this can help, the data I am looking for is the acceleration data, I have recorded it manually and it is a double.
Name Size Bytes Class Attributes
acc 6251x1 50008 double
Thanks again.

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Accepted Answer

Fangjun Jiang
Fangjun Jiang on 31 Jul 2019
In your model, you have a "To Workspace" block logging four signals and writing to a workspace variable "simout". Of course, the workspace variable "simout" is going to be over-written in every for-iteration.
In your script, your also specified a return variable "simout" when calling sim(). This is probably a unintended mistake. Not to mention the name conflict (both are called simout but they are logging different contents). simout=sim() can return values but the contents are dependent on the "Data Import/Export" setting in the model Configuration Parameters. You can't use [out1, out2, out3, out4] = sim(mdl) to expect to return those four signals that you want to log.
I suggest the following and you can take a look at one cell of "Loggings"
mdl = 'PSDfaulty';
x = [0.8:0.01:0.95];
for i = 1:numel(x)
set_param([mdl '/FrontFault'] , 'Value' , num2str(x(i)));
sim(mdl);
Loggings{i}=simout; % simout is the variable name specified in the "To Workspace" block
end
  3 Comments
Fangjun Jiang
Fangjun Jiang on 31 Jul 2019
Edited: Fangjun Jiang on 31 Jul 2019
No. You need to keep the "To Workspace" block but not to return variable in sim() call as indicated in my answer. You got 16 cells because "simout" already exists in workspace but all cells are the same.
To acchieve variable name as acc1, acc2, ... (not recommended), you could add a set_param() line in your for-loop to change the variable name of the "To Workspace" block. Then you just need to run the loop with sim(), no need to copy to annother variable e.g. Loggings.
Sergio Rueda
Sergio Rueda on 31 Jul 2019
Edited: Sergio Rueda on 1 Aug 2019
Sorry, but I checked the cells and are not the same, they have different data, and they are the data I need. Only these are more useful to me by having them in different variables. Thanks for responding, it has been very useful.
Edit: actually just typing Loggins{n,n} I can acces to the info and use it as I need. Thanks for the reply.

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