Algebraic Loops Created in Migration to 2010a

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Phil 2011-1-20

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https://ww2.mathworks.cn/matlabcentral/answers/168-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.

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Seth Popinchalk 2011-1-20

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

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Answer 1

Seth Popinchalk 2011-1-20

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

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Todd Flanagan 2011-1-24

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 2011-2-3

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

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