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Author Topic: inverse matrix  (Read 4396 times)

Irpanni

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inverse matrix
« on: December 20, 2014, 08:00:18 AM »
Dear Admin,

I am using umani function in order to modified vector normal of shell structures.

For mesh more than 324 element. I found a problem in inverse matrix with using DLINRG.  In layer, it shown "warning Error 1 from DLINRG. the matrix is too ill-conditioned. the inverse matrix might not be accurate".

Is there anyone know, how to fix for that?

thank you very much for your kindly attention
regards
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Prof. R.L. Taylor

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Re: inverse matrix
« Reply #1 on: December 20, 2014, 08:09:32 AM »
Inverting a large matrix is not a very good thing to do.  It is hard to know your difficulty without information on the algorithm you are trying to implement to modify the shell normal. 
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FEAP_Admin

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Re: inverse matrix
« Reply #2 on: December 20, 2014, 10:34:47 AM »
btw, the message you quote is not generated by FEAP.  It must be coming form one of your own routines or something else you have added to FEAP.
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