User`s guide

3 Simulink 4.1 Release Notes
3-6
Enhanced Engine Model Demos
The top and bottom dead center detection in the engine and enginewc demo
models now use a reset integrator. In previous versions, the models used a
triggered subsystem to detect angular position. This method resulted in
inefficiencies and a slower, less accurate solution. In addition, self-triggering
subsystems are now illegal in Simulink.
Setting Block Sorting Priority on Virtual Subsystems
In Simulink 4.0, it was an error to specify a priority on a virtual subsystem. In
Simulink 4.1, you can specify priorities on virtual subsystems.
Using ~ in Filenames on UNIX
Now all filename fields in Simulink support the mapping of the ~ character in
filenames. For example, in a To File block, you can specify
~/outdir/file.mat.
On most systems, this will expand to
/home/$USER/outdir/file.mat.
Improved Warning About Slow Signals Feeding the Enable Port of an
Enabled Subsystem Containing Fast Blocks
In a multitasking environment, deterministic results cannot be guaranteed if
a slow signal feeds the enable port of an enabled subsystem that contains fast
blocks. In previous versions, Simulink did not issue a warning in some cases
where this may occur.
Flagging Function-Call Subsystem Cycles
In previous versions, Simulink allowed you to build models containing
function-call-cycles, i.e., function-call subsystems that directly or indirectly call
themselves.