> Methods where the true residual Ax-b > is expensive to calculate and is not there for free in the iterative > process (like BiCGStab for example) use the pseudo residual.
Looks like I was wrong and the default behavior of BiCGStab is indeed the true residual, which is calculated with an additional Matrix-Vector product. Ah well, but the default for QMRS is the other way around. :-) -- Timo Heister http://num.math.uni-goettingen.de/~heister _______________________________________________ dealii mailing list http://poisson.dealii.org/mailman/listinfo/dealii
