<div dir="ltr"><div dir="ltr">On Mon, Feb 25, 2019 at 4:56 PM Fazlul Huq 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"><div dir="ltr"><div style="font-family:"comic sans ms",sans-serif">Hello PETSc Developers,<br clear="all"></div><div style="font-family:"comic sans ms",sans-serif"><br></div><div style="font-family:"comic sans ms",sans-serif">I have solved a very simple poisson problem with different matrix sizes (10 to 10^7).</div><div style="font-family:"comic sans ms",sans-serif">But when I have compared error norm_2 for the solution, I got the attached curve.</div><div style="font-family:"comic sans ms",sans-serif">It looks like error norm_2 increases with increasing matrix size. Shouldn't it decrease rather with increasing matrix size?</div></div></blockquote><div><br></div><div>Yes that is completely wrong.</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"><div dir="ltr"><div style="font-family:"comic sans ms",sans-serif">Thanks.</div><div style="font-family:"comic sans ms",sans-serif"><br></div><div style="font-family:"comic sans ms",sans-serif">Sincerely,</div><div style="font-family:"comic sans ms",sans-serif">Huq</div>-- <br><div dir="ltr" class="gmail-m_2541832371374711768gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><br><div><font face="comic sans ms, sans-serif">Fazlul Huq</font></div><div><font face="comic sans ms, sans-serif">Graduate Research Assistant</font></div><div><font face="comic sans ms, sans-serif">Department of Nuclear, Plasma & Radiological Engineering (NPRE)</font></div><div><font face="comic sans ms, sans-serif">University of Illinois at Urbana-Champaign (UIUC)</font></div><div><font face="comic sans ms, sans-serif">E-mail: <a href="mailto:huq2090@gmail.com" target="_blank">huq2090@gmail.com</a></font></div></div></div></div></div></div></div></div>
</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>