<div dir="ltr"><div dir="ltr">On Fri, Jun 10, 2022 at 3:59 PM NILTON SANTOS VALDIVIA <<a href="mailto:100442268@alumnos.uc3m.es">100442268@alumnos.uc3m.es</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">Hello Matthew,<div><br></div><div>Thank you very much for your answer. What I'm trying to do is to solve a linear system using the A and b (matrix and vector) provided in <a href="https://sparse.tamu.edu/FEMLAB/waveguide3D" target="_blank">https://sparse.tamu.edu/FEMLAB/waveguide3D</a> (no matter if its a .mat or a .mtx file) and also I want to solve the system with multiple MPI processes, I'm not an expert on it, just starting to understand the procedure. I'd really appreciate if you could help me with this exercise.</div></div></blockquote><div><br></div><div>I would:</div><div><br></div><div> 1) Download the Matrix Market format</div><div><br></div><div> 2) Use Mat test ex72 to read that matrix + vector and output them in PETSc binary format</div><div><br></div><div> 3) Use KSP ex10 to read the PETSc binary format and test your solver</div><div><br></div><div> Thanks,</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><div><div dir="ltr"><div dir="ltr">Best Regards,<div><br></div><div>NILTON SANTOS</div></div></div></div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">El vie, 10 jun 2022 a las 19:57, Matthew Knepley (<<a href="mailto:knepley@gmail.com" target="_blank">knepley@gmail.com</a>>) escribió:<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, Jun 10, 2022 at 1:15 PM NILTON SANTOS VALDIVIA <<a href="mailto:100442268@alumnos.uc3m.es" target="_blank">100442268@alumnos.uc3m.es</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">Hello, <div><br></div><div>I was trying to load a sparse matrix from a .MAT file (and solve the linear system). But even though, I have extracted the A and b matrix and vector from this suite <b><a href="https://sparse.tamu.edu/FEMLAB/waveguide3D" target="_blank">https://sparse.tamu.edu/FEMLAB/waveguide3D</a></b> and saved the variables (A, b) in a MAT file as PETSC recommends, I couldn't be able to load the matrix. Is there something that I was doing wrong? or do you know a way to load a matrix from the above link?</div><div><br></div><div>Actually I was using <a href="https://petsc.org/main/src/ksp/ksp/tutorials/ex10.c.html" style="box-sizing:border-box;text-decoration-line:none;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Helvetica Neue",Arial,sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol";font-size:15px" target="_blank">src/ksp/ksp/tutorials/ex10.c.html</a> example to try to load a .MAT file (containing A and b) without success.</div></div></blockquote><div><br></div><div>Do you want to load a Matrix Market format matrix and vector? If so, this is what <a href="https://petsc.org/main/src/mat/tests/ex72.c.html" target="_blank">https://petsc.org/main/src/mat/tests/ex72.c.html</a> does.</div><div><br></div><div> Thanks,</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> <br></div><div><div><div dir="ltr"><div dir="ltr">Best Regards,<div><br></div><div>NILTON SANTOS</div><div><br></div></div></div></div></div></div>
</blockquote></div><br clear="all"><div><br></div>-- <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>
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</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>