<div dir="ltr"><div class="gmail_extra"><div class="gmail_quote">On Fri, Oct 28, 2016 at 8:05 AM, leejearl <span dir="ltr"><<a href="mailto:leejearl@126.com" target="_blank">leejearl@126.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
  
    
  
  <div>
    Hi, Matt:<br>
        Thank you for your help. It is the answer which I expect. <br>
        But， I have an another equestion. Can I obtain the coordinates
    of the ghost cells:<br>
    </div></blockquote><div><br></div><div>I am not sure I understand. By default, Plex stores coordinates only for vertices. Also, ghost cells</div><div>do not have a full complement of vertices because they are only used to define a state on the other</div><div>side of a face. Does that make sense?</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>    Thanks,<br>
    <br>
    leejearl<br>
    <br>
    <div class="m_7510602955081850294moz-cite-prefix">On 2016年10月28日 19:56, Matthew Knepley
      wrote:<br>
    </div>
    <blockquote type="cite">
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        <div class="gmail_extra">
          <div class="gmail_quote">On Fri, Oct 28, 2016 at 6:32 AM,
            leejearl <span dir="ltr"><<a href="mailto:leejearl@126.com" target="_blank">leejearl@126.com</a>></span>
            wrote:<br>
            <blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Hi, everyone:<br>
              <br>
                  I have a distributed DMPlex representing a 2D finite
              volume mesh. I distributed it using the function
              "DMPlexDistribute()".<br>
              <br>
              Then, I constructed the ghost cells using
              "DMPlexConstructGhostCells()".<br>
              <br>
                 The question is that I want to determine which cell is
              ghosted. I obtained all the cells using
              "DMPlexGetHeightStratum()", and<br>
              <br>
              how can I kown which cell is ghosted?<br>
            </blockquote>
            <div><br>
            </div>
            <div>1) The ghost cells are marked as "hybrid", so you can
              call</div>
            <div><br>
            </div>
            <div>  ierr  = DMPlexGetHybridBounds(dm, &cEndInterior,
              NULL, NULL, NULL);CHKERRQ(ierr);</div>
            <div>
              <div>  ierr  = DMPlexGetHeightStratum(dm, 0, NULL,
                &cEnd);CHKERRQ(ierr);</div>
            </div>
            <div><br>
            </div>
            <div>and then the ghost cells are [cEndInterior, cEnd).</div>
            <div><br>
            </div>
            <div>2) There is also a label "ghost" which marks the ghost
              faces, and ghost cells which are non-local</div>
            <div><br>
            </div>
            <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">
                 Thanks, all the helps are appreciated.<span class="m_7510602955081850294gmail-HOEnZb"><font color="#888888"><br>
                  <br>
                  <br>
                  leejearl<br>
                  <br>
                  <br>
                  <br>
                </font></span></blockquote>
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          <br>
          <br clear="all"><span class="HOEnZb"><font color="#888888">
          <div><br>
          </div>
          -- <br>
          <div class="m_7510602955081850294gmail_signature">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>
        </font></span></div>
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    </blockquote>
    <br>
    <pre class="m_7510602955081850294moz-signature" cols="72"></pre>
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</blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature" data-smartmail="gmail_signature">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></div>