What solver should I use then? just direct solver? Edith > On Oct 10, 2016, at 2:47 PM, Wolfgang Bangerth <[email protected]> wrote: > > On 10/10/2016 01:24 PM, Edith Sotelo wrote: >> I am solving for a plane wave. >> laplacian (u) +k^2 u =0 domain (0,1) * (0,1) ; k =20 for this case > > This is the "bad" sign. If k is large enough, your operator (and consequently > the matrix) will not be positive definite. Consequently, CG may not converge. > > Best > W. > > -- > ------------------------------------------------------------------------ > Wolfgang Bangerth email: [email protected] > www: http://www.math.colostate.edu/~bangerth/ > > -- > The deal.II project is located at http://www.dealii.org/ > For mailing list/forum options, see > https://groups.google.com/d/forum/dealii?hl=en > --- You received this message because you are subscribed to a topic in the > Google Groups "deal.II User Group" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/dealii/F6_iqj1mJnA/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > [email protected]. > For more options, visit https://groups.google.com/d/optout.
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