a simple question

liufeng19 · Post by **liufeng19** » Thu Dec 21, 2006 5:36 am

what is the meaning of "WARNING BandGenLinLapackSolver::solve<> -LAPACK routine returned 1", after i run the program? how to solve the problem of convergence like this?

Post by **fmk** » Thu Dec 21, 2006 10:02 am

it indicates a problem with the matrix .. which,
given the fact you are using a banded general, probably means you have a singular matrix ..
if this is occuring in the first step it means you don't have enough constraints, if during an analysis which was working and suddenly stops with this error it also means a rigid body mode, however in this case you can see what iterating with some initial stiffness iterations might do.

liufeng19 · Post by **liufeng19** » Fri Dec 22, 2006 4:10 am

thank you very very much!!

liufeng19 · Post by **liufeng19** » Fri Dec 22, 2006 8:16 am

what is the so-called rigid body mode? is that caused by usage of rigidLink in model?

silvia · Post by **silvia** » Thu Feb 08, 2007 9:48 am

it means you do not have enough constraints in your model.