Algebraic Loops Created in Migration to 2010a

I have been using a SIMULINK model for some time now in MATLAB 2008b/Simulink 7.2 with no problems. I recently imported the model into MATLAB 2010a/SIMULINK 7.5 and tried to use it and had lots of problems with Algebraic Loops.

I modified the settings in the 2008b version but was unable to identify any algebraic loops (at least none where the 2010a version found them!) I modified the model in 2008b to add some filtering to the supposed algebraic loop points and retried in 2010a - This resolved the previously identified Algerbraic Loops, but has now resulted in 'new' algebraic loop being 'created' - this one can NOT be sensibly removed by adding a filter etc to the model.

Any suggestions? I find it most unusual that simply upgrading from 2008b to 2010a should cause the creation of Algebraic Loops.

[Seth Popinchalk]

Phil - what are the blocks involved in the loop? During the upgrade to R2010a did you try running SLUPDATE?

Answer 1

[Seth Popinchalk]

I think I need more information to properly answer this question, however, upgrade issues are often addressed by running SLUPDATE. Give that a try!

[Todd Flanagan]

Phil said, "Thanks Seth,

Will try that and see what happens...... will let you know if there are any problems still remaining after the weekend."

[Doug Hull]

Phil said:

Seth,

I ran the SLUPDATE function, but that didn't seem to resolve the issue directly.

However, after some other modifications to the model (for changes to the system) and re-running the SLUPDATE routine, everything seems to have been resolved.

Thanks for the help

Phil