Thank you, Wolfgang

I'll look into it. 

Best,

David

On Thursday, February 20, 2025 at 8:27:18 PM UTC-5 Wolfgang Bangerth wrote:

>
> On 2/20/25 14:18, David Montiel wrote:
> > /An error occurred in line <2204> of file <../source/lac/ 
> > lapack_full_matrix.cc> in function/
> > 
> > /    void 
> > dealii::LAPACKFullMatrix<number>::compute_eigenvalues_symmetric(number, 
> > number, number, dealii::Vector<OtherNumber>&, 
> > dealii::FullMatrix<number>&) [with number = double]/
> > 
> > /The violated condition was: /
> > 
> > /    info == 0/
> > 
> > /Additional information: /
> > 
> > /    Lapack error in syevx: 1 eigenvectors failed to converge. (You may/
> > 
> > /    need to scale the abs_accuracy according to your matrix norm.)/
> > 
> > //
>
> David:
> This is at its core a question about LAPACK and what kinds of matrices 
> it can compute eigenvalues/eigenvectors of. Have you searched the 
> internet what that error message means? How big is the matrix, and is it 
> indeed symmetric?
>
> Best
> W.
>

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