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<p class="MsoNormal">Hello,</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I created a new thread, thought would it be more appropriate (and is a continuation of my previous post). I want to construct the below K matrix (which is composed of submatrices)
</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:black;mso-ligatures:none;mso-fareast-language:EN-GB">K = [A P^T</span><span style="font-size:10.0pt;color:#212121;mso-ligatures:none;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black;mso-ligatures:none;mso-fareast-language:EN-GB"> P 0]<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black;mso-ligatures:none;mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:black;mso-ligatures:none;mso-fareast-language:EN-GB">Where K is of type MatMPIAIJ. I first constructed the top left [A] using MatSetValues().<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black;mso-ligatures:none;mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:black;mso-ligatures:none;mso-fareast-language:EN-GB">Now, I would like to construct the bottom left [p] and top right [p^T]
</span>using MatSetValuesLocal().</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">To use MatSetValuesLocal(), I first have to create a local-to-global mapping using ISLocalToGlobalMappingCreate. I have created two mapping row_mapping and column_mapping.</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:black;mso-ligatures:none;mso-fareast-language:EN-GB">Q1) At what point should I declare
</span>MatSetLocalToGlobalMapping – is it just before I use MatSetValuesLocal()?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I will use MatSetLocalToGlobalMapping(K, row_mapping, column_mapping) to build
<span style="color:black;mso-ligatures:none;mso-fareast-language:EN-GB">the bottom left [P].<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black;mso-ligatures:none;mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:black;mso-ligatures:none;mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:black;mso-ligatures:none;mso-fareast-language:EN-GB">Q2) Can now I reset the mapping as
</span>MatSetLocalToGlobalMapping(K, column_mapping, row_mapping) to build <span style="color:black;mso-ligatures:none;mso-fareast-language:EN-GB">
the top right [P^T]? <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black;mso-ligatures:none;mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Many thanks!<span style="color:black;mso-ligatures:none;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black;mso-ligatures:none;mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:black;mso-ligatures:none;mso-fareast-language:EN-GB">Kind regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black;mso-ligatures:none;mso-fareast-language:EN-GB">Karthik.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black;mso-ligatures:none;mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:black;mso-ligatures:none;mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:black;mso-ligatures:none;mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:black;mso-ligatures:none;mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:black;mso-ligatures:none;mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:#212121;mso-ligatures:none;mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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