Why does the SIM command from Simulink 4.0 (R12) work incorrectly when you do not use left-hand arguments?

Why does the SIM command from Simulink 4.0 (R12) work incorrectly when you do not use left-hand arguments?

The following code will illustrate this problem:

vdp;

set_param('vdp', 'SaveFinalState', 'On');

a=simget('vdp');

a=simset(a, 'FinalStateName','myname');

a.FinalStateName

sim('vdp', 20, a);

whos

The SIMSET command works and sets a new name instead of the default name "xFinal". However, after the simulation "xFinal" instead of "myname", is written in the workspace.

If you use left-hand arguments with the SIM command, it works correctly:

[t,x,y]=sim('vdp',20,myopts);

returns the changed name.

sim('vdp',20,myopts);

returns the default name.

Answer 1

[MathWorks Support Team]

This enhancement has been incorporated in Release 2009b (R2009b). For previous product releases, read below for any possible workarounds:

This inconsistency has been verified in Simulink.

As a workaround, use the SIM command with left-hand arguments.