Is there a hidden workspace in Simulink other than the model workspace?

When running a Simulink model, I get unexpected behaviors if I don't call a clear all before the execution. Strange thing is that both the base and the model workspaces are empty. What could be happening? Where else can I look for those hidden variables?

Thanks!

Answer 1

[Guilherme T Silva]

I found out what was wrong: Simulink won't clear S-functions static memory from run to run. I'm using clear mex for that. Thanks!

Answer 2

[Walter Roberson]

One of things that clear all does is to clear out the parsed versions of routines (which you do not care about) along with their attached workspaces -- that is, any accumulated persistent variables, which could potentially be an issue.

[Guilherme T Silva]

Do you have any suggestion on how to debug this? How can I at least visualize that accumulated data?

[Walter Roberson]

There is no documented way to detect persistent variables in loaded functions and examine those variables -- other than doing a text search for "persistent" and putting in breakpoints.