1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
|
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML3.2 EN">
<HTML>
<HEAD> <link rel="canonical" href="http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/DMPLEX/DMPlexFindVertices.html" />
<META NAME="GENERATOR" CONTENT="DOCTEXT">
<TITLE>DMPlexFindVertices</TITLE>
</HEAD>
<BODY BGCOLOR="FFFFFF">
<div id="version" align=right><b>petsc-3.14.5 2021-03-03</b></div>
<div id="bugreport" align=right><a href="mailto:petsc-maint@mcs.anl.gov?subject=Typo or Error in Documentation &body=Please describe the typo or error in the documentation: petsc-3.14.5 v3.14.5 docs/manualpages/DMPLEX/DMPlexFindVertices.html "><small>Report Typos and Errors</small></a></div>
<A NAME="DMPlexFindVertices"><H1>DMPlexFindVertices</H1></A>
Try to find DAG points based on their coordinates.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscdmplex.h"
#include "petscfe.h"
<A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../DMPLEX/DMPlexFindVertices.html#DMPlexFindVertices">DMPlexFindVertices</A>(<A HREF="../DM/DM.html#DM">DM</A> dm, <A HREF="../Sys/PetscInt.html#PetscInt">PetscInt</A> npoints, const <A HREF="../Sys/PetscReal.html#PetscReal">PetscReal</A> coord[], <A HREF="../Sys/PetscReal.html#PetscReal">PetscReal</A> eps, <A HREF="../Sys/PetscInt.html#PetscInt">PetscInt</A> dagPoints[])
</PRE>
Not Collective (provided <A HREF="../DM/DMGetCoordinatesLocalSetUp.html#DMGetCoordinatesLocalSetUp">DMGetCoordinatesLocalSetUp</A>() has been called already)
<P>
<H3><FONT COLOR="#CC3333">Input Parameters</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>dm </B></TD><TD>- The DMPlex object
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>npoints </B></TD><TD>- The number of sought points
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>coords </B></TD><TD>- The array of coordinates of the sought points
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>eps </B></TD><TD>- The tolerance or <A HREF="../Sys/PETSC_DEFAULT.html#PETSC_DEFAULT">PETSC_DEFAULT</A>
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Output Parameters</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>dagPoints </B></TD><TD>- The array of found DAG points, or -1 if not found
</TD></TR></TABLE>
<P>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
The length of the array coords must be npoints * dim where dim is the spatial dimension returned by <A HREF="../DM/DMGetDimension.html#DMGetDimension">DMGetDimension</A>().
<P>
The output array dagPoints is NOT newly allocated; the user must pass an array of length npoints.
<P>
Each rank does the search independently; a nonnegative value is returned only if this rank's local DMPlex portion contains the point.
<P>
The tolerance is interpreted as the maximum Euclidean (L2) distance of the sought point from the specified coordinates.
<P>
Complexity of this function is currently O(mn) with m number of vertices to find and n number of vertices in the local mesh. This could probably be improved.
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../DMPLEX/DMPlexCreate.html#DMPlexCreate">DMPlexCreate</A>(), <A HREF="../DM/DMGetCoordinatesLocal.html#DMGetCoordinatesLocal">DMGetCoordinatesLocal</A>()
<BR><P><B></B><H3><FONT COLOR="#CC3333">Level</FONT></H3>intermediate<BR>
<H3><FONT COLOR="#CC3333">Location</FONT></H3>
</B><A HREF="../../../src/dm/impls/plex/plexgeometry.c.html#DMPlexFindVertices">src/dm/impls/plex/plexgeometry.c</A>
<BR><A HREF="./index.html">Index of all DMPLEX routines</A>
<BR><A HREF="../../index.html">Table of Contents for all manual pages</A>
<BR><A HREF="../singleindex.html">Index of all manual pages</A>
</BODY></HTML>
|
