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<div class="moz-cite-prefix">Le 13/01/2014 19:00, Matthew Knepley a
écrit :<br>
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cite="mid:CAMYG4Gkk1VNH2jkdjhmbPXf1_zR_M+ma1z0DM0+4=BquYwBGTg@mail.gmail.com"
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<div class="gmail_quote">On Mon, Jan 13, 2014 at 9:47 AM, Rémi
Lacroix <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:remi.lacroix@inria.fr" target="_blank">remi.lacroix@inria.fr</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">Hello,<br>
<br>
I would like to permute an index set with another index
set, just like you can do for vectors using VecScatter.<br>
<br>
I have two index sets IS1 and IS2 which share the same
size but have different parallel layouts. I often need to
permute vectors/matrices using those two index sets (as in
first permute with IS1 then permute the result with IS2).
Since I don't use the intermediate result, I would like to
permute IS1 with IS2 to get a new index set so that I can
permute directly my vectors/matrices with it. Is that
possible using Petsc?<br>
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<div><br>
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<div>We do not have this particular composition in our
interface. However, you could accomplish this using
PetscSF.</div>
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<div> Thanks,
<div><br>
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<div> Matt</div>
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<br>
Thanks for the quick answer.<br>
<br>
So basically I need to have a look at the underlying mechanism of
VecScatter and implement something similar for IS. How complex would
it be in practice?<br>
<br>
Rémi<br>
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