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<div id="version" align=right><b>petsc-3.14.5 2021-03-03</b></div>
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<A NAME="DMStagVecGetValuesStencil"><H1>DMStagVecGetValuesStencil</H1></A>
get vector values using grid indexing
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
<A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../DMSTAG/DMStagVecGetValuesStencil.html#DMStagVecGetValuesStencil">DMStagVecGetValuesStencil</A>(<A HREF="../DM/DM.html#DM">DM</A> dm, <A HREF="../Vec/Vec.html#Vec">Vec</A> vec,<A HREF="../Sys/PetscInt.html#PetscInt">PetscInt</A> n,const <A HREF="../DMSTAG/DMStagStencil.html#DMStagStencil">DMStagStencil</A> *pos,<A HREF="../Sys/PetscScalar.html#PetscScalar">PetscScalar</A> *val)
</PRE>
Not Collective
<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 DMStag object
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>vec </B></TD><TD>- the vector object
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>n </B></TD><TD>- the number of values to obtain
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>pos </B></TD><TD>- locations to obtain values from (as an array of <A HREF="../DMSTAG/DMStagStencil.html#DMStagStencil">DMStagStencil</A> values)
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Output Parameter</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>val </B></TD><TD>- value at the point
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
Accepts stencils which refer to global element numbers, but
only allows access to entries in the local representation (including ghosts).
<P>
This approach is not as efficient as setting values directly with <A HREF="../DMSTAG/DMStagVecGetArray.html#DMStagVecGetArray">DMStagVecGetArray</A>(), which is recommended for matrix free operators.
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../DMSTAG/DMSTAG.html#DMSTAG">DMSTAG</A>, <A HREF="../DMSTAG/DMStagStencil.html#DMStagStencil">DMStagStencil</A>, <A HREF="../DMSTAG/DMStagStencilLocation.html#DMStagStencilLocation">DMStagStencilLocation</A>, <A HREF="../DMSTAG/DMStagVecSetValuesStencil.html#DMStagVecSetValuesStencil">DMStagVecSetValuesStencil</A>(), <A HREF="../DMSTAG/DMStagMatSetValuesStencil.html#DMStagMatSetValuesStencil">DMStagMatSetValuesStencil</A>(), <A HREF="../DMSTAG/DMStagVecGetArray.html#DMStagVecGetArray">DMStagVecGetArray</A>()
<BR><P><B></B><H3><FONT COLOR="#CC3333">Level</FONT></H3>advanced<BR>
<H3><FONT COLOR="#CC3333">Location</FONT></H3>
</B><A HREF="../../../src/dm/impls/stag/stagstencil.c.html#DMStagVecGetValuesStencil">src/dm/impls/stag/stagstencil.c</A>
<P><H3><FONT COLOR="#CC3333">Examples</FONT></H3>
<A HREF="../../../src/dm/impls/stag/tutorials/ex1.c.html">src/dm/impls/stag/tutorials/ex1.c.html</A><BR>
<A HREF="../../../src/dm/impls/stag/tutorials/ex4.c.html">src/dm/impls/stag/tutorials/ex4.c.html</A><BR>
<A HREF="../../../src/dm/impls/stag/tutorials/ex6.c.html">src/dm/impls/stag/tutorials/ex6.c.html</A><BR>
<BR><A HREF="./index.html">Index of all DMSTAG routines</A>
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