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<p>Hi Matt,</p>
<p>Thanks for the rapid response. The reason I want to ensure I
have a DMDA is that this is a custom gradient function, the
results of which are meaningless for anything but a regular grid.
I would rather raise an exception upfront with the user than allow
the program to continue with garbage data.</p>
<p>Phil<br>
</p>
<div class="moz-cite-prefix">On 25/09/18 11:55, Matthew Knepley
wrote:<br>
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cite="mid:CAMYG4Gn9xBC=PmBLy4mfqwc-YmaWiZXA7wop9Pr52JYq=EwhEA@mail.gmail.com">
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<div dir="ltr">On Tue, Sep 25, 2018 at 6:49 AM Phil Tooley
<<a href="mailto:phil.tooley@sheffield.ac.uk"
moz-do-not-send="true">phil.tooley@sheffield.ac.uk</a>>
wrote:<br>
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<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">Hi all,<br>
<br>
Given a vector I know I can get an associated DM (if there
is one) by<br>
calling VecGetDM, but I need to also be able to check that<br>
<br>
a) the vector is the localvector of that DM rather than
the global<br>
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<div>Get a local vector from the DM and check the sizes.</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">
b) the DM is a DMDA rather than some other subclass<br>
</blockquote>
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<div>You can do this (PetscObjectTypeCompare), but it is not
recommended. Why would</div>
<div>you want to do that?</div>
<div><br>
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<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">
I can't immediately see routines that do what I need, but
I am likely<br>
missing something obvious. Is there a way to achieve the
above?<br>
<br>
Thanks<br>
<br>
Phil<br>
<br>
-- <br>
Phil Tooley<br>
Research Software Engineering<br>
University of Sheffield<br>
<br>
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-- <br>
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<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/%7Eknepley/"
target="_blank" moz-do-not-send="true">https://www.cse.buffalo.edu/~knepley/</a><br>
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<pre class="moz-signature" cols="72">--
Phil Tooley
Research Software Engineering
University of Sheffield</pre>
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