[petsc-users] Print ||r(i)||/||Ax0-b|| while monitoring

[Matthew Knepley]

On Thu, Oct 27, 2011 at 1:15 PM, Dominik Szczerba <dominik at itis.ethz.ch>wrote:

> Is there an equivalent of -ksp_monitor_true_residual to get
>
> ||r(i)||/||Ax0-b||   (x0 initial guess)
>
> instead of
>
> ||r(i)||/||b||
>
> ?
>

You can easily make a custom monitor that does what you want. The code for
the
original is in src/ksp/ksp/interface/iterativ.c

   Matt


> Many thanks,
> Dominik
>



-- 
What most experimenters take for granted before they begin their experiments
is infinitely more interesting than any results to which their experiments
lead.
-- Norbert Wiener
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