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<p>Hi there,</p>
<p>I am trying to switch btw two different sections (section_l(1:2))
defined on the same DM (one section for the dependent variable,
the other for their gradient)</p>
<p>
<blockquote type="cite">
<span style="font-family:monospace"><span
style="color:#1818b2;background-color:#ffffff;">!</span><span
style="color:#000000;background-color:#ffffff;">
</span><br>
<span style="color:#1818b2;background-color:#ffffff;">!
dependent variables and their nodal gradient</span><span
style="color:#000000;background-color:#ffffff;">
</span><br>
<span style="color:#1818b2;background-color:#ffffff;">!</span><span
style="color:#000000;background-color:#ffffff;">
</span><br>
<span style="color:#000000;background-color:#ffffff;">
PetscCall(DMSetLocalSection(dm, section_l(</span><span
style="color:#b21818;background-color:#ffffff;">1</span><span
style="color:#000000;background-color:#ffffff;">), ierr)) </span><span
style="color:#1818b2;background-color:#ffffff;">! dependent
variables</span><span
style="color:#000000;background-color:#ffffff;">
</span><br>
<span style="color:#000000;background-color:#ffffff;">
PetscCall(DMGetLocalVector(dm, localu, ierr)) </span><span
style="color:#1818b2;background-color:#ffffff;">! dependent
variables</span><span
style="color:#000000;background-color:#ffffff;">
</span><br>
<span style="color:#000000;background-color:#ffffff;">
PetscCall(DMGlobalto</span><span
style="color:#af5f00;background-color:#ffffff;">Local</span><span
style="color:#000000;background-color:#ffffff;">(dm, u,
INSERT_VALUES, localu, ierr))</span><span
style="color:#000000;background-color:#ffffff;">
</span><br>
<span style="color:#000000;background-color:#ffffff;">
PetscCall(VecSet(gradu, </span><span
style="color:#b21818;background-color:#ffffff;">0.d0</span><span
style="color:#000000;background-color:#ffffff;">, ierr))</span><span
style="color:#000000;background-color:#ffffff;">
</span><br>
<span style="color:#000000;background-color:#ffffff;">
PetscCall(DMSetLocalSection(dm, section_l(</span><span
style="color:#b21818;background-color:#ffffff;">2</span><span
style="color:#000000;background-color:#ffffff;">), ierr)) </span><span
style="color:#1818b2;background-color:#ffffff;">! gradient
of the dependent variables</span><span
style="color:#000000;background-color:#ffffff;">
</span><br>
<span style="color:#000000;background-color:#ffffff;">
PetscCall(DMGetLocalVector(dm, localdu, ierr)) </span><span
style="color:#1818b2;background-color:#ffffff;">! gradient
of the dependent variables</span><span
style="color:#000000;background-color:#ffffff;">
</span><br>
<span style="color:#000000;background-color:#ffffff;">
PetscCall(VecSet(localdu, </span><span
style="color:#b21818;background-color:#ffffff;">0.d0</span><span
style="color:#000000;background-color:#ffffff;">, ierr))</span><span
style="color:#000000;background-color:#ffffff;">
</span><br>
<span style="color:#1818b2;background-color:#ffffff;">!</span><span
style="color:#000000;background-color:#ffffff;">
</span><br>
<span style="color:#000000;background-color:#ffffff;"> </span><span
style="color:#af5f00;background-color:#ffffff;">call</span><span
style="color:#000000;background-color:#ffffff;"> </span><span
style="color:#18b2b2;background-color:#ffffff;">innerloop</span><span
style="color:#000000;background-color:#ffffff;">(dm, localu,
localdu, section_l, ierr)</span><br>
<span style="color:#000000;background-color:#ffffff;">
</span><br>
</span>
</blockquote>
subroutine innerloop is supposed to do work on both Vecs.</p>
<p>When trying to do so, I get the following error:</p>
<p>
<blockquote type="cite">
<span style="font-family:monospace"><span
style="color:#000000;background-color:#ffffff;">[0]PETSC
ERROR: --------------------- Error Message
--------------------------------------------------------------</span><span
style="color:#000000;background-color:#ffffff;">
</span><br>
<span style="color:#000000;background-color:#ffffff;">[0]PETSC
ERROR: Object is in wrong state</span><span
style="color:#000000;background-color:#ffffff;">
</span><br>
<span style="color:#000000;background-color:#ffffff;">[0]PETSC
ERROR: Clearing DM of local vectors that has a local vector
obtained with DMGetLocalVector()</span><br>
<span style="color:#000000;background-color:#ffffff;">
</span><br>
</span>
</blockquote>
as if two sections living simultaneously on the same DM are not
allowed.</p>
<p>Should I instead clone the DM and create the "second" section of
the clone?</p>
<p>Thanks,</p>
<p>Aldo</p>
<pre class="moz-signature" cols="72">--
Dr. Aldo Bonfiglioli
Associate professor of Fluid Mechanics
Dipartimento di Ingegneria
Universita' della Basilicata
V.le dell'Ateneo Lucano, 10 85100 Potenza ITALY
tel:+39.0971.205203 fax:+39.0971.205215
web: <a class="moz-txt-link-freetext" href="https://urldefense.us/v3/__http://docenti.unibas.it/site/home/docente.html?m=002423__;!!G_uCfscf7eWS!YVPmxuMFuutpshSi89LXW-8W6oF1lauFcuN2HzqwcvecXbGkhDoRlhVqyIdHvFHEXN7_zUPSCbdoeElWRBtO1fQ_1q-v4pzF0QU$">http://docenti.unibas.it/site/home/docente.html?m=002423</a></pre>
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