Inverse Dynamics Errors?

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Lisa MacFadden
Posts: 14
Joined: Mon Aug 20, 2007 3:01 pm

Inverse Dynamics Errors?

Post by Lisa MacFadden » Thu Sep 18, 2008 3:38 pm

Does anyone know what to do when you run an inverse dynamics analysis and obtain

-1.#IND0000000000000000 and
-1.#INF0000000000000000
are your results for your joint torques? How can you fix this problem?

Thank you
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Kathleen Reilly
Posts: 30
Joined: Fri Jan 11, 2008 6:25 am

RE: Inverse Dynamics Errors?

Post by Kathleen Reilly » Thu Sep 18, 2008 8:49 pm

This most likely means there is an inconsistency in one of your motion files. Look through those and you will probably find a spot where there is data missing for just a frame or two, resulting in errors like #INF or #NaN.
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Lisa MacFadden
Posts: 14
Joined: Mon Aug 20, 2007 3:01 pm

RE: Inverse Dynamics Errors?

Post by Lisa MacFadden » Thu Sep 18, 2008 9:00 pm

Thank you for your response. I checked it out and that doesn't seem to be the problem. Additionally I am getting those results for the entire motion- Ack :-) Any other ideas what might be going on?

Thanks again!
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Ayman Habib
Posts: 2235
Joined: Fri Apr 01, 2005 12:24 pm

RE: Inverse Dynamics Errors?

Post by Ayman Habib » Sun Sep 21, 2008 2:12 pm

Lisa,

If you're doing dynamics you better have good mass/inertial properties assigned.

Good luck,
-Ayman
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