On 10/13/2017 02:06 AM, Mark Ma wrote:
later, I changed the control into
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SolverControlsolver_control (5*system_rhs.size(),1e-12*system_rhs.l2_norm())
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this works well for structure size of um or nm. I think previous setting may
lead to a loss of precision so that the results are always incorrect.
Yes, indeed -- using a tolerance relative to the size of the rhs vector is
important.
Best
W.
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Wolfgang Bangerth email: bange...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/
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