<div dir="ltr"><div dir="ltr">On Tue, Apr 25, 2023 at 8:53 AM Stefano Carli <<a href="mailto:stefano.carli@kuleuven.be">stefano.carli@kuleuven.be</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 class="msg1702879428265607757">
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<p class="MsoNormal"><span lang="EN-US">Dear PETSc developers,<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">I’m using PETSc version 3.14.1 coupled to a Fortran code, and I was wondering if there is a way of obtaining in output, possibly at each iteration, the estimated Hessian matrix for the BQNLS method.</span></p></div></div></div></blockquote><div><br></div><div>It is represented as the outer product of sets of vectors. Is that what you want?</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 class="msg1702879428265607757"><div lang="EN-GB" style="overflow-wrap: break-word;"><div class="m_1702879428265607757WordSection1">
<p class="MsoNormal"><span lang="EN-US">Thank you in advance and best regards,<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">Stefano Carli<u></u><u></u></span></p>
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</div></blockquote></div><br clear="all"><div><br></div><span class="gmail_signature_prefix">-- </span><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>