Question

I have some processing (moving of wheelset). Wheelset has mass, it’s variable and it’s declaring in init.m file (for example M=1;)

Now I want that in this proccess mass of wheelset will be changed every 2 seconds. How to save the new value of mass to M variable from Simulink?

Answer 1

For me I’ve found the decision.

I’ve used variable M for storing object mass. And from simulink I’ve just called M in function calls. For example:

But calling function Rho in MATLAB Function block looks like:

This approach works only if M is static. Now I want to change M dinamically in time. So, first I’ve decided that I can make M global and change it. I’ve written a function, made a function block which was calculating new M value and setting it’s to global M variable. But it didn’t work. You can’t at the same time use and change one global variable in Simulink.

So I’ve decided to change the whole approach. As M is now not static parameter, I should make M as signal. So now it looks like:

Here in block Constant M is getting from workspace (or some init.m file) and then Simulink works not with M variable from workspace, but with local signal M