Report errors in parameter study

Hi Anybody Group,

I have a question concerning the report of errors during parameter
studies. Is there a flag or something similar which indicates that
there occurred an error during a certain iteration of a parameter
study (e.g. “Muscle recruitment analysis failed” during inverse
dynamic analysis)? Currently I am checking my output data and compare
the values of each iteration. If there is the same value twice for
different consecutive iterations I know that there might have been an
error during this certain iteration. But if I have a large number of
iterations, it is difficult to check the output data of every single
iteration without making a mistake. I hope it is clear what my
question is about.

Thank You,
Peter

Hello Peter,

I think I understood you and I must admit that there is no general error
status report functionality for individual steps in parameters studies; or
other design studies for that matter.

It is indeed a good idea - I will place it on our wish list.

I think we have managed so far without this by doing tricks for determining
an error state like you are doing now. I cannot recall exact implementations
that I have seen used, but I could imagine some cases:

For instance you may compare the kinematical error to the kinematical
tolerance to verify that the last or all steps have been kinematically
solved properly. Or you may look at the final time, t, of study to see
whether the analysis reached its final time.

Such measures of success could be entered into the design study (in your
case the parameter study) as a AnyDesignMeasure. Then you can see it on a
graph afterwards. Or you can embed it into your main measure if you like.

I have also seen cases where for instance a kinematical error measure was
added as a penalty to some objective function used in an optimization study.
This functioned to make the optimization process good back from regions with
kinematical failure for instance “when the arm couldn’t reach” or the like.

I hope this might give you an idea on how to get on with your study, even
though the general facility you were looking for doesn’t exist.

Otherwise let us know; maybe with a little more details about your case.

.or let me know if I misunderstood you question.

Best regards,

Michael


Michael Damsgaard, AnyBody Support

<http://www.anybodytech.com> www.anybodytech.com


From: anyscript@yahoogroups.com [mailto:anyscript@yahoogroups.com] On Behalf
Of peter.belei
Sent: Tuesday, July 01, 2008 11:02
To: anyscript@yahoogroups.com
Subject: [AnyScript] Report errors in parameter study

Hi Anybody Group,

I have a question concerning the report of errors during parameter
studies. Is there a flag or something similar which indicates that
there occurred an error during a certain iteration of a parameter
study (e.g. “Muscle recruitment analysis failed” during inverse
dynamic analysis)? Currently I am checking my output data and compare
the values of each iteration. If there is the same value twice for
different consecutive iterations I know that there might have been an
error during this certain iteration. But if I have a large number of
iterations, it is difficult to check the output data of every single
iteration without making a mistake. I hope it is clear what my
question is about.

Thank You,
Peter

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