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.
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Wolfgang Bangerth email: [email protected]
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