How do I change the block parameters in a Simulink model through matlab script?

I'm working on a simple pendulum design and I was looking to make interaction with the simulink model easier by creating a matlab script where you can change the pendulum weight and length of the string by modifying the parameters in the matlab script. However I'm unsure on how to do this. I'm pretty new to matlab hence my lack of knowledge on something which seems rather simple and was wondering if anyone could point me in the right direction to start?

Answer 1

[ES]

two ways: 1. Create workspace variables in the m script. Refer the variables in the constant blocks instead of direct values. Eg, in m script, create PENDULUM_LENGTH = 10. Use this "PENDULUM_LENGTH" in your model instead of 10.

2. Use set_param Using set_param command, you can modify the parameters of model. Example:

set_param(blockpath, 'value', '10');

In both cases, for model to know the updated value, you need to do an model update.

set_param(bdroot,'SimulationCommand','Update')

[Ellis Wilcox]

I've tried this with my model but doesn't seem to function as required. The block I'm trying to modify from the script in a solids block from the simMechanics library. Is it possible to modify the parameters of a simMechanics block from a matlab script?