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<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/DMDA/DMDAGetRay.html "><small>Report Typos and Errors</small></a></div>
<A NAME="DMDAGetRay"><H1>DMDAGetRay</H1></A>
Returns a vector on process zero that contains a row or column of the values in a <A HREF="../DMDA/DMDA.html#DMDA">DMDA</A> vector
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscdmda.h"
<A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../DMDA/DMDAGetRay.html#DMDAGetRay">DMDAGetRay</A>(<A HREF="../DM/DM.html#DM">DM</A> da,<A HREF="../DM/DMDirection.html#DMDirection">DMDirection</A> dir,<A HREF="../Sys/PetscInt.html#PetscInt">PetscInt</A> gp,<A HREF="../Vec/Vec.html#Vec">Vec</A> *newvec,<A HREF="../Vec/VecScatter.html#VecScatter">VecScatter</A> *scatter)
</PRE>
Collective on <A HREF="../DMDA/DMDA.html#DMDA">DMDA</A>
<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>da </B></TD><TD>- the distributed array
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>vec </B></TD><TD>- the vector
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>dir </B></TD><TD>- Cartesian direction, either <A HREF="../DM/DMDirection.html#DMDirection">DM_X</A>, <A HREF="../DM/DMDirection.html#DMDirection">DM_Y</A>, or <A HREF="../DM/DMDirection.html#DMDirection">DM_Z</A>
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>gp </B></TD><TD>- global grid point number in this direction
</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>newvec </B></TD><TD>- the new vector that can hold the values (size zero on all processes except process 0)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>scatter </B></TD><TD>- the <A HREF="../Vec/VecScatter.html#VecScatter">VecScatter</A> that will map from the original vector to the slice
</TD></TR></TABLE>
<P>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
All processors that share the <A HREF="../DMDA/DMDA.html#DMDA">DMDA</A> must call this with the same gp value
<P>
<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/da/dasub.c.html#DMDAGetRay">src/dm/impls/da/dasub.c</A>
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