<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">It’s a 4x4 matrix.<div class="">The first 2x2 diagonal matrix is a field.<div class="">The second 2x2 diagonal matrix is another field.</div><div class="">In the second field, the first diagonal coefficient is a subfield.</div><div class="">In the second field, the second diagonal coefficient is another subfield.</div><div class="">I’m changing the operators from the second subfield (last diagonal coefficient of the matrix).</div><div class="">When I solve a system with the complete matrix (2 fields), I get a different “partial solution" than when I solve the “partial system” on just the second field (with the two subfields in which I modified the operators from the second one).</div><div class=""><br class=""></div><div class="">I don’t know if this makes more or less sense… sorry :\</div><div class="">Thanks,</div><div class="">Pierre<br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On 24 Mar 2019, at 8:42 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" class=""><div dir="ltr" class="">On Sat, Mar 23, 2019 at 9:12 PM Pierre Jolivet via petsc-dev <<a href="mailto:petsc-dev@mcs.anl.gov" class="">petsc-dev@mcs.anl.gov</a>> wrote:<br class=""></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">I’m trying to figure out why both solutions are not consistent in the following example.<br class="">
Is what I’m doing complete nonsense?<br class=""></blockquote><div class=""><br class=""></div><div class="">The code does not make clear what you are asking. I can see its a nested fieldsplit.</div><div class=""><br class=""></div><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:1px solid rgb(204,204,204);padding-left:1ex">
Thanks in advance for your help,<br class="">
Pierre<br class="">
<br class="">
</blockquote></div><br clear="all" class=""><div class=""><br class=""></div>-- <br class=""><div dir="ltr" class="gmail_signature"><div dir="ltr" class=""><div class=""><div dir="ltr" class=""><div class=""><div dir="ltr" class=""><div class="">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 class=""><br class=""></div><div class=""><a href="http://www.cse.buffalo.edu/~knepley/" target="_blank" class="">https://www.cse.buffalo.edu/~knepley/</a><br class=""></div></div></div></div></div></div></div></div>
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