Problem with Simscape variable visibility

Hi all,

I have created a simulink model of a circuit using simscape electrical elements. I have also created two callbacks, InitFcn and StopFcn to initialize some parameters and postprocess the results, respectively. In particular, the initialization function randomly sets the value of some parameters used by the simulink model, whereas the StopFcn callback takes the results in the log of simulation data (those available in Simscape Results Explorer) and analyze them, saving the results on a file.

Everything runs smoothly if I start the simulation within Simulink pressing the run button.

In order to automatize the study, I have created a simple matlab script to run the model multiple times. The script is really simple and looks like this

for i = 1:10
    % run simulink
    sim('threePhaseDiodeRectifierFilterVariable');
end

At this point I have problems because Matlab returns an error that I can't read correctly:

Error using modelSweep (line 3)
Error evaluating 'StopFcn' callback of block_diagram 'threePhaseDiodeRectifierFilterVariable'.
Callback string is 'threePhaseDiodeRectifierFilterVariable_output'
Caused by:
    Error using modelSweep (line 3)
    Unable to resolve the name
    out.simlog_threePhaseDiodeRectifierFilterFiveCoils.Current_Sensor_Three_Phase.I_output.series.values.
    

I tried to debug the code, setting a breakpoint before loading the simulation data from the variable 'out...', but this variable does not exist anymore. I think the problem is related to the visibility of the simscape data that are no longer available when the simulink model is run with the command sim, but this is only my guess and I don't know how to figure out the solution.

Does anybody have an idea of what's happening?

Thank you in advance

Fabio

Answer 1

[Fangjun Jiang]

If I remember it correctly, all you need to do is to give sim() a return variable. Just try it

result=sim('threePhaseDiodeRectifierFilterVariable');

now I found the reference

https://www.mathworks.com/matlabcentral/answers/646918-my-simulink-model-seems-to-not-receiving-proper-variables-from-workspace-or-not-returning-proper-val

[Fabio Freschi]

Fangjun,

I am very sorry for my late reply. Unfortunately, your solution didn't solve initially my problem, but it was my fault. I tried multiple times and in the and I figured out where I was wrong.

This is indeed the solution I was looking for. Thank you for you help

Fabio