User`s guide

Bug Fixes
3-11
•Sorting bug fix
Previous versions incorrectly computed the direct feedthrough setting for
nonvirtual subsystems in triggered/function-call subsystems. This resulted
in incorrect execution (sorting) orders. Now all nonvirtual subsystems within
triggered subsystems have their direct feedthrough (needs input) flags set
for all input ports. This is needed because a nonvirtual subsystem with a
triggered sample time executes both its output and update methods together
within the context of the model's output method.
•Fixed handling of grounded/unconnected inputs feeding certain blocks
Simulink 4.0 incorrectly handled grounded or unconnected inputs to level-1
and level-2 S-functions requiring contiguous inputs and to some Matrix
blocks. This has been fixed in Simulink 4.1.