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<p class="MsoNormal"><span style="font-size:11.0pt">What do you do with something like a void pointer? I’m looking at the TaoSetObjectiveAndGradient function and it wants to pass a void *ctx pointer. You can set this to null, but apparently you have to specify
the type. What type should I use? Is there something called PETSC_NULL_VOID or PETSC_NULL_CONTEXT or do I use something else?<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span style="font-size:12.0pt;color:black">From:
</span></b><span style="font-size:12.0pt;color:black">Matthew Knepley <knepley@gmail.com><br>
<b>Date: </b>Tuesday, December 12, 2023 at 8:33 AM<br>
<b>To: </b>Palmer, Bruce J <Bruce.Palmer@pnnl.gov><br>
<b>Cc: </b>petsc-users@mcs.anl.gov <petsc-users@mcs.anl.gov><br>
<b>Subject: </b>Re: [petsc-users] Fortran Interface<o:p></o:p></span></p>
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<span style="font-size:11.0pt;font-family:"Arial",sans-serif;color:black">Check twice before you click! This email originated from outside PNNL.</span><span style="font-size:11.0pt;font-family:"Arial",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">On Tue, Dec 12, 2023 at 11:27 AM Palmer, Bruce J via petsc-users <<a href="mailto:petsc-users@mcs.anl.gov">petsc-users@mcs.anl.gov</a>> wrote:<o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt">Does documentation for the PETSc fortran interface still exist? I looked at the web pages for 3.20 (<a href="http://petsc.org/release" target="_blank">petsc.org/release</a>)
but if you go under the tab C/Fortran API, only descriptions for the C interface are there.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">I think after the most recent changes, the interface was supposed to be very close to C, so we just document the differences on specific pages, and put the general stuff here:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> <a href="https://petsc.org/release/manual/fortran/">https://petsc.org/release/manual/fortran/</a><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> Thanks,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> Matt<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt">Bruce Palmer<o:p></o:p></span></p>
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<o:p></o:p></span></p>
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<p class="MsoNormal"><span class="gmailsignatureprefix"><span style="font-size:11.0pt">--
</span></span><span style="font-size:11.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">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<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"><a href="http://www.cse.buffalo.edu/~knepley/" target="_blank">https://www.cse.buffalo.edu/~knepley/</a><o:p></o:p></span></p>
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