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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Thanks for your example. My problem is resolved. Meanwhile I am wondering, if it is possible to make this example more flexible. I mean what if the columns in
each row are different? Is there any way to insert them all together?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Regards<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Bin<o:p></o:p></span></p>
<p class="MsoNormal"><a name="_MailEndCompose"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></a></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Junchao Zhang [mailto:junchao.zhang@gmail.com]
<br>
<b>Sent:</b> Monday, 13 April 2020 11:33 PM<br>
<b>To:</b> Bin Liu <lbllm2018@hotmail.com><br>
<b>Cc:</b> petsc-users@mcs.anl.gov<br>
<b>Subject:</b> Re: [petsc-users] inserting multiple rows together into a matrix<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Add two rows 2 ,4, and each row has three nonzeros at column 3, 7, 9<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">m=2;</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">n=3;</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">idxm[] = {2, 4};</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">idxn[] = {3, 7, 9};</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">v[6] = {0.1, 0.2, ....};</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">MatSetValues(mat, m, idxm, n, idxn,v, INSERT_VALUES);</span><o:p></o:p></p>
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<p class="MsoNormal"><br clear="all">
<o:p></o:p></p>
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<p class="MsoNormal">--Junchao Zhang<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Mon, Apr 13, 2020 at 9:59 AM Bin Liu <<a href="mailto:lbllm2018@hotmail.com">lbllm2018@hotmail.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">Hi all,</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">I know how to insert values in one row into the matrix via routine “MatSetValues”. I understand I logically should be able to insert multiple rows into the matrix
with one call of “MatSetValues”. However, I am not sure how to do it. I searched in the PETSc mail list and did not find a relevant question answered before. Could anyone help me and give me a simple example code?</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">Regards</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">B.
</span><o:p></o:p></p>
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