<div dir="ltr"><div>I have a parallel AIJ matrix and I know exactly which element belongs to each one of the 4 submatrices blocks I want to use to solve the linear system. The blocks are not strided, because they have different number of elements.<br><br>I understand that I must use PCFieldSplitSetIS(), since PCFieldSplitSetFields() is only for strided blocks. What I don't understand is how to create the IS structure I must pass to it.<br><br>Each matrix coefficient is identified by a pair (i, j), but on IS creation functions, like ISCreateGeneral() and ISCreateBlock(), I am supposed to provide a one dimension set of indices. How does these indices relates to the matrix coefficients?<br><br>Also, ISCreateGeneral() seems to create a single block, and ISCreateBlock() seems to create multiple blocks of the same size. How to create multiple blocks with different sizes?<br><br></div>Thanks.<br><div><br><div>-- <br><div class="gmail-m_2241921660572272385gmail_signature">Lucas Clemente Vella<br><a href="mailto:lvella@gmail.com" target="_blank">lvella@gmail.com</a></div>
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