<div dir="ltr"><div class="gmail_quote"><div dir="ltr">On Thu, Jul 19, 2018 at 6:21 AM Emiel van de Ven <<a href="mailto:emiel.van.de.ven@gmail.com">emiel.van.de.ven@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>Dear PETSc users,</div><div><br></div><div>I have a mesh where I have a label that contains some elements. If I understand correctly, after uniform refinement, the label also contains the refined faces and vertices. Since I'd like to have only cells in the label, I thought to remove the rest using something like:</div><div><br></div><div>DMPlexGetDepthStratum(dm, 3, &vStart, &vEnd);</div><div>DMLabelFilter(label, vStart, vEnd);</div><div><br></div><div>However, I don't fully understand the functioning of DMLabelFilter. When vStart>0, it works as I would expect, but when vStart=0, it simply removes all the points from the label. Why is this happening?</div><div><br></div><div>Since for the cells vStart usually is 0, I can't use this method. Am I missing something?</div><div><br></div><div>Attached is a minimal working example.</div></div></blockquote><div><br></div><div>I have just compiled and run your example. This is what I get:</div><div><br></div><div>




<span></span>





<p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-weight:normal;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo">master *:~/Downloads/tmp$ ./main</p>
<p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-weight:normal;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo">Label 'Cell Sets':</p>
<p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-weight:normal;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo"><span class="gmail-Apple-converted-space">  </span>Index has been calculated in [1, 10)</p>
<p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-weight:normal;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo">[0]: 1 (4)</p>
<p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-weight:normal;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo">[0]: 2 (4)</p>
<p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-weight:normal;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo">[0]: 3 (4)</p>
<p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-weight:normal;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo">[0]: 4 (4)</p>
<p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-weight:normal;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo">[0]: 5 (4)</p>
<p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-weight:normal;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo">[0]: 6 (4)</p>
<p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-weight:normal;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo">[0]: 7 (4)</p>
<p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-weight:normal;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo">[0]: 8 (4)</p>
<p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-weight:normal;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo">[0]: 9 (4)</p>
<p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-weight:normal;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo">Label 'Cell Sets':</p>
<p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-weight:normal;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo"><span class="gmail-Apple-converted-space">  </span>Index has been calculated in [0, 10)</p>
<p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-weight:normal;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo">[0]: 1 (4)</p>
<p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-weight:normal;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo">[0]: 2 (4)</p>
<p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-weight:normal;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo">[0]: 3 (4)</p>
<p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-weight:normal;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo">[0]: 4 (4)</p>
<p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-weight:normal;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo">[0]: 5 (4)</p>
<p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-weight:normal;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo">[0]: 6 (4)</p>
<p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-weight:normal;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo">[0]: 7 (4)</p>
<p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-weight:normal;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo">[0]: 8 (4)</p>
<p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-weight:normal;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo">[0]: 9 (4)</p>


<br></div><div>What version are your running with?</div><div><br></div><div>  Thanks,</div><div><br></div><div>    Matt</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>Best,</div><div>Emiel<br></div></div>
</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><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.caam.rice.edu/~mk51/" target="_blank">https://www.cse.buffalo.edu/~knepley/</a><br></div></div></div></div></div></div>