<div dir="ltr"><div dir="ltr">On Mon, Aug 5, 2019 at 12:36 PM Smith, Barry F. via petsc-users <<a href="mailto:petsc-users@mcs.anl.gov">petsc-users@mcs.anl.gov</a>> wrote:<br></div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><br>
Yes, this is a bug. We previously declared a tiny trust region as converged but in fact it is not diverged. In the master branch it now comes up as a negative value in indicating diverging of the nonlinear solver. Sorry for the confusion.<br></blockquote><div><br></div><div>Barry, you have to put in a deprecation entry for that change so that it does not break compiles.</div><div><br></div><div> Thanks,</div><div><br></div><div> Matt</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
Barry<br>
<br>
<br>
> On Aug 5, 2019, at 10:38 AM, Fande Kong via petsc-users <<a href="mailto:petsc-users@mcs.anl.gov" target="_blank">petsc-users@mcs.anl.gov</a>> wrote:<br>
> <br>
> I have zero experience on the trust region Newton. I would like PETSc Team chime in.<br>
> <br>
> Fande,<br>
> <br>
> On Mon, Aug 5, 2019 at 9:34 AM Gary Hu <<a href="mailto:hugary1995@gmail.com" target="_blank">hugary1995@gmail.com</a>> wrote:<br>
> Hello Group,<br>
> <br>
> When I use -snes_type newtontr<br>
> <br>
> I sometimes get CONVERGED_TR_DELTA instead of CONVERGED_FNORM.<br>
> <br>
> My guess is that the trust region size keeps reducing until it becomes smaller than the tolerance.<br>
> <br>
> Is there a way to force the algorithm to converge only due to FNORM?<br>
> <br>
> Thanks,<br>
> Gary<br>
> <br>
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</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div>What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.<br>-- Norbert Wiener</div><div><br></div><div><a href="http://www.cse.buffalo.edu/~knepley/" target="_blank">https://www.cse.buffalo.edu/~knepley/</a><br></div></div></div></div></div></div></div></div>