<div dir="ltr">Following your comments, I did an test.<div>However, if I run the application in parallel. </div><div>In all processes, it is not possible to obtain values at all positions in the matrix through MatGetValue.</div><div>As in the previous case of saving in binary, it is read in parallel divided form.<br></div><div>Is it impossible to want to get the all value in the whole process?<br></div><div><br></div><div><br></div><div>Thanks,</div><div>Hyung Kim</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">2023년 3월 17일 (금) 오후 7:35, Matthew Knepley <<a href="mailto:knepley@gmail.com">knepley@gmail.com</a>>님이 작성:<br></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 dir="ltr">On Fri, Mar 17, 2023 at 5:51 AM user_gong Kim <<a href="mailto:ksi2443@gmail.com" target="_blank">ksi2443@gmail.com</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"><p class="MsoNormal" style="margin:0cm 0cm 8pt;text-align:justify;line-height:107%;font-size:10pt;font-family:"\00b9d1\00c740 \00ace0\00b515""><span lang="EN-US">Hello,</span></p>
<p class="MsoNormal" style="margin:0cm 0cm 8pt;text-align:justify;line-height:107%;font-size:10pt;font-family:"\00b9d1\00c740 \00ace0\00b515""><span lang="EN-US"> </span></p>
<p class="MsoNormal" style="margin:0cm 0cm 8pt;text-align:justify;line-height:107%;font-size:10pt;font-family:"\00b9d1\00c740 \00ace0\00b515""><span lang="EN-US">I have 2 questions about MatView.</span></p>
<p class="MsoNormal" style="margin:0cm 0cm 8pt;text-align:justify;line-height:107%;font-size:10pt;font-family:"\00b9d1\00c740 \00ace0\00b515""><span lang="EN-US"> </span></p>
<p style="margin:0cm 0cm 8pt 40pt;text-align:justify;line-height:107%;font-size:10pt;font-family:"\00b9d1\00c740 \00ace0\00b515""><span lang="EN-US">1.<span style="font-variant-numeric:normal;font-variant-east-asian:normal;font-variant-alternates:normal;font-kerning:auto;font-feature-settings:normal;font-stretch:normal;font-size:7pt;line-height:normal;font-family:"Times New Roman"">
</span></span><span lang="EN-US">I would like to ask if the
process below is possible.<br>
When running in parallel, is it possible to make the matrix of the mpiaij
format into a txt file, output it, and read it again so that the entire process
has the same matrix?</span></p></div></blockquote><div>No. However, you can do this with a binary viewer. I suggest using</div><div><br></div><div> MatViewFromOptions(mat, NULL, "-my_view");</div><div><br></div><div>and then the command line argument</div><div><br></div><div> -my_view binary:mat.bin</div><div><br></div><div>and then you can read this in using</div><div><br></div><div> MatCreate(PETSC_COMM_WORLD, &mat);</div><div> PetscViewerBinaryOpen(PETSC_COMM_WORLD, "mat.bin", FILE_MODE_READ, &viewer);</div><div> MatLoad(mat, viewer);</div><div> ViewerDestroy(&viewer);</div><div><br></div><div> THanks,</div><div><br></div><div> Matt</div><div><br></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">
<p style="margin:0cm 0cm 8pt 40pt;text-align:justify;line-height:107%;font-size:10pt;font-family:"\00b9d1\00c740 \00ace0\00b515""><span lang="EN-US">2.<span style="font-variant-numeric:normal;font-variant-east-asian:normal;font-variant-alternates:normal;font-kerning:auto;font-feature-settings:normal;font-stretch:normal;font-size:7pt;line-height:normal;font-family:"Times New Roman"">
</span></span><span lang="EN-US">If possible, please let me know
which function can be used to create a txt file and how to read the txt file.</span></p>
<p class="MsoNormal" style="margin:0cm 0cm 8pt;text-align:justify;line-height:107%;font-size:10pt;font-family:"\00b9d1\00c740 \00ace0\00b515""><span lang="EN-US"> </span></p>
<p class="MsoNormal" style="margin:0cm 0cm 8pt;text-align:justify;line-height:107%;font-size:10pt;font-family:"\00b9d1\00c740 \00ace0\00b515""><span lang="EN-US">Thanks,</span></p>
<p class="MsoNormal" style="margin:0cm 0cm 8pt;text-align:justify;line-height:107%;font-size:10pt;font-family:"\00b9d1\00c740 \00ace0\00b515""><span lang="EN-US">Hyung Kim</span></p></div>
</blockquote></div><br clear="all"><div><br></div><span>-- </span><br><div dir="ltr"><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>
</blockquote></div>