How to input the sample time of model (.slx file) from a .m file?

Hello, I want to integrate the model and the .m file together such that I don't have to open the model file to make the necessary changes. The only two parameters I need to change are Simulation end time and Sample time. While I have found a way to edit simulation end time using the sim('model', [0 sim_end]) command, I cant seem to find the way to control the sample time (powergui/configure parameters/solver/simulation type: discrete/sample time). Please help

[Varun Jadhav]

I found a way, putting the sampling time in the script and defining it with a variable, & putting that variable name in the "Sample Time" space. But is there a way to choose the simulation type (discrete/continuous) and solvers (TBE/Tustin/Backward Euler)?

Answer 1

[Sebastian Castro]

Yes, this is possible using the set_param function. Note that the powergui block changed in R2015a (I believe) to be more "Simulink-like", so I'm working off the latest version when I tried this out.

To change the model's stop time is a global model setting, so you can do something like:

>> modelName = 'myModel';
>> load_system(modelName);
>> set_param(modelName,'StopTime','50')

To change the powergui block properties, you have to use the block name. For example:

>> blockName = 'myModel/powergui'; % You can obtain this by selecting the block and typing gcb
>> set_param(blockName,'SimulationMode','Discrete')
>> set_param(blockName,'SolverType','Tustin/Backward Euler (TBE)')
>> set_param(blockName,'SampleTime','1e-6')

- Sebastian

[Varun Jadhav]

Thanks a lot, Sebastian... It works... :)