<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><br class=""><div><blockquote type="cite" class=""><div class="">On Feb 9, 2017, at 2:17 PM, Matthew Knepley <<a href="mailto:knepley@gmail.com" class="">knepley@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><div class="gmail_extra"><div class="gmail_quote">On Thu, Feb 9, 2017 at 7:06 AM, Pierre Jolivet<span class="Apple-converted-space"> </span><span dir="ltr" class=""><<a href="mailto:pierre.jolivet@enseeiht.fr" target="_blank" class="">pierre.jolivet@enseeiht.fr</a>></span><span class="Apple-converted-space"> </span>wrote:<br class=""><blockquote class="gmail_quote" style="margin: 0px 0px 0px 0.8ex; border-left-width: 1px; border-left-style: solid; border-left-color: rgb(204, 204, 204); padding-left: 1ex;"><div style="word-wrap: break-word;" class=""><br class=""><div class=""><blockquote type="cite" class=""><div class="">On Feb 9, 2017, at 1:37 PM, Matthew Knepley <<a href="mailto:knepley@gmail.com" target="_blank" class="">knepley@gmail.com</a>> wrote:</div><br class="gmail-m_-7129509824056556353Apple-interchange-newline"><div class=""><div dir="ltr" class=""><div class="gmail_extra"><div class="gmail_quote">On Thu, Feb 9, 2017 at 4:56 AM, Pierre Jolivet<span class="Apple-converted-space"> </span><span dir="ltr" class=""><<a href="mailto:pierre.jolivet@enseeiht.fr" target="_blank" class="">pierre.jolivet@enseeiht.fr</a>></span><span class="Apple-converted-space"> </span>wrote:<br class=""><blockquote class="gmail_quote" style="margin: 0px 0px 0px 0.8ex; border-left-width: 1px; border-left-style: solid; border-left-color: rgb(204, 204, 204); padding-left: 1ex;">Hello,<br class="">I _might_ be doing something wrong when calling KSPSetFromOptions/KSPSetUp, but still, am I supposed to get this kind of error?<br class="">[0]PETSC ERROR: No support for this operation for this object type<br class="">[0]PETSC ERROR: KSP gmres does not support PRECONDITIONED with RIGHT<br class=""><br class="">If not, I’ll try to send a MWE (it basically depends on where I set the option -ksp_pc_side right).<br class=""></blockquote><div class=""><br class=""></div><div class="">I believe its telling you that it cannot display the preconditioned residual with right preconditioning, which is true.</div><div class="">Are you requesting both?</div></div></div></div></div></blockquote><div class=""><br class=""></div><div class="">No, I’m just using -ksp_view and -ksp_pc_side right. In the “standard” case, it obviously work.</div><div class="">However, the error is triggered if I set -ksp_pc_side right after a first call to KSPSetOperators()/KSPSetUp() without destroying the KSP.</div><div class="">Should I destroy my KSP before changing from left- (default) to right-preconditioning if KSPSetOperators()/KSPSetUp has already been called?</div></div></div></blockquote><div class=""><br class=""></div><div class="">Its likely you have to use</div><div class=""><br class=""></div><div class=""> <a href="http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/KSP/KSPSetNormType.html" class="">http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/KSP/KSPSetNormType.html</a></div><div class=""><br class=""></div><div class="">or</div><div class=""><br class=""></div><div class=""> <b style="font-family: times; font-size: inherit;" class="">-ksp_norm_type unpreconditioned</b></div></div></div></div></div></blockquote><div><br class=""></div><div>If I use this after my first call to KSPSetUp, I now end up with:</div><div>[0]PETSC ERROR: KSP gmres does not support UNPRECONDITIONED with LEFT</div><br class=""><blockquote type="cite" class=""><div class=""><div dir="ltr" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><div class="gmail_extra"><div class="gmail_quote"><div class="">since we would not have a chance to change it since its been set already.</div><div class=""><br class=""></div><div class=""> <span class="Apple-converted-space"> </span>Thanks,</div><div class=""><br class=""></div><div class=""> Matt</div><div class=""><br class=""></div><blockquote class="gmail_quote" style="margin: 0px 0px 0px 0.8ex; border-left-width: 1px; border-left-style: solid; border-left-color: rgb(204, 204, 204); padding-left: 1ex;"><div style="word-wrap: break-word;" class=""><div class=""><div class="">Thanks.</div><br class=""><blockquote type="cite" class=""><div class=""><div dir="ltr" class=""><div class="gmail_extra"><div class="gmail_quote"><div class=""> Thanks,</div><div class=""><br class=""></div><div class=""> Matt</div><div class=""> </div><blockquote class="gmail_quote" style="margin: 0px 0px 0px 0.8ex; border-left-width: 1px; border-left-style: solid; border-left-color: rgb(204, 204, 204); padding-left: 1ex;">Thanks,<br class="">Pierre</blockquote></div><br class=""><br clear="all" class=""><span class="gmail-HOEnZb"><font color="#888888" class=""><div class=""><br class=""></div>--<span class="Apple-converted-space"> </span><br class=""><div class="gmail-m_-7129509824056556353gmail_signature">What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.<br class="">-- Norbert Wiener</div></font></span></div></div></div></blockquote></div><br class=""></div></blockquote></div><br class=""><br clear="all" class=""><div class=""><br class=""></div>--<span class="Apple-converted-space"> </span><br class=""><div class="gmail_signature">What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.<br class="">-- Norbert Wiener</div></div></div></div></blockquote></div><br class=""></body></html>