Missing ashow (command to find algebraic loops in Simulink)

I want to eliminate algebraic loops in my Simulink model. Apparently there is a command ashow to highlight algebraic loops. Supposedly ashow can be executed at the Matlab command line with no arguments, however I get the following error: Undefined function or variable 'ashow'. I am using R2011b.

Why might I be missing the command ashow?

Answer 1

[K E]

In case it is useful to someone else, this page explains that ashow requires that the user has the Simulink Debugger running before executing the ashow command.