Set Simulink model simulation stop time from m file

I want to set my models simulation stop time from an m file, but I'm a little confused about how to go about it. When I'd get the data for blocks I'd use get_param, but I want to get the parameters of the model. Would I go about it the same way? Thanks.

Answer 1

[Kaustubha Govind]

You can set_param for the model also:

   set_param('modelname', 'StopTime', '3000')

[Danijel Domazet]

I tried this and it sets the time OK (after sim is done, I open the diagram and new value is visible), but when I run the simulation sim('test_sim') it does not take this value. Why is this happening?

Could you provide the link to documentation for StopTime?

[Ben MacCallum]

If you are using the sim function to run your model, you can set the stop time as follows,

sim('model_name', 'StopTime', '40');

[Athira Km]

Thank you but how to set this dynamically from a parameter instead of a constant value?

Answer 2

[Bill Tubbs]

You can also do it by passing it as an argument when you run the simulation from the m file:

sim_out = sim(sim_model, t_stop)

[Paul]

This doesn't work anymore. Has the syntax changed recently?

I get the following error:

Expected a string scalar or character vector for the parameter name.

[Bill Tubbs]

Hmm. Not sure. Are you converting t_stop to a string? This is the exact statement I am using right now with MATLAB v2021b. Maybe you need to include the option char array like this:

sim_out = sim(sim_model, 'StartTime', '0', 'StopTime', string(t(end)));

[Bill Tubbs]

Actually, the original code I posted above where t_stop is a number does also work in 2021b. Maybe this behaviour has been removed in recent versions. Nevertheless, maybe it's best to always include 'StopTime' and use string(t_stop).