problem with eigen command

canim_ken · Post by **canim_ken** » Tue Feb 24, 2009 9:01 am

Hi,
I'm getting an error message when im trying to retrieve eigenvalues of higher modes from my model. the error body is:

BandArpackSolver::Error with _saupd info = -9999
Could not build an Arnoldi factorization.IPARAM(5) returns the size of the current Arnoldi factorization. The user is advised to check thatenough workspace and array storage has been allocated.
Warning FrequencyAlgo::solveCurrentStep() - the EigenSOE failed in solve().
EigenAnalysis::analyze() - algorithm failed

i have no error when i type the [eigen 1] command but for higher modes the error appears.

Please help me to solve the problem, Thanks

silvia · Post by **silvia** » Tue Feb 24, 2009 12:04 pm

you can only solve for N-1 eigenvalues, where N is the number of dynamic dofs.

canim_ken · Post by **canim_ken** » Thu Feb 26, 2009 12:45 pm

[quote="silvia"]you can only solve for N-1 eigenvalues, where N is the number of dynamic dofs.[/quote]
thanks for your reply, but i solved it in a different way by assigning some negligible masses to some nodes.