<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;"><div><br></div> Galerkin cannot be used completely from the command line since the Galerkin subspace needs to be defined. This is done with `PCGalerkinSetRestriction`(pc,R) and/or `PCGalerkinSetInterpolation`(pc,P). So you must construct and provide an appropriate R and or P for your problem.<div><br></div><div> Sorry the error message is not very good and is confusing.</div><div><br></div><div> Barry<br id="lineBreakAtBeginningOfMessage"><div><br><blockquote type="cite"><div>On Sep 19, 2024, at 8:53 AM, Edoardo alinovi <edoardo.alinovi@gmail.com> wrote:</div><br class="Apple-interchange-newline"><div><div dir="ltr"><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div dir="ltr"><div>Hi Barry,</div><div><br></div><div>I have a quick question on PC Galerking as I am trying to do the same thing reported in this post: <a href="https://urldefense.us/v3/__https://lists.mcs.anl.gov/pipermail/petsc-users/2017-June/032934.html__;!!G_uCfscf7eWS!bQ0VYCU_TuGCB-803OHYrdOURUwlOpEAp1j5pu1v1Kh6eUgPPdRF_wkiLfrW342u8LNZ4mpCiqz4OxsAOywju5ZUi9bIZUs$">https://lists.mcs.anl.gov/pipermail/petsc-users/2017-June/032934.html</a></div><div><br></div><div>This my command line:</div><div>mpirun -np 4 flubio_coupled<b> -UPeqn_pc_type composite -UPeqn_pc_composite_pcs galerkin,bjacobi -UPeqn_sub_0_galerkin_ksp_type preonly -UPeqn_sub_0_galerkin_pc_type none</b><br></div><div><br></div><div>And this is the error:</div><div>[0]PETSC ERROR: --------------------- Error Message --------------------------------------------------------------<br>[0]PETSC ERROR: Object is in wrong state<br>[0]PETSC ERROR: Must set operator of PCGALERKIN KSP with PCGalerkinGetKSP()/KSPSetOperators()<br></div><div><br></div><div>Do I need to set something for PCGALERKING in my code to make it work from command line? <br></div><div><br></div><div>Thank you!</div><div><br></div></div></div></div></div>
</div></blockquote></div><br></div></body></html>