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<div id="version" align=right><b>petsc-3.7.5 2017-01-01</b></div>
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<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="../DM/DMDA.html#DMDA">DMDA</A> vector
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscdmda.h"
PetscErrorCode DMDAGetRay(DM da,DMDADirection dir,PetscInt gp,Vec *newvec,VecScatter *scatter)
</PRE>
Collective on <A HREF="../DM/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 DMDA_X, DMDA_Y, or DMDA_Z
</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="../DM/DMDA.html#DMDA">DMDA</A> must call this with the same gp value
<P>
<H3><FONT COLOR="#CC3333">Keywords</FONT></H3>
distributed array, get, processor subset
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>advanced
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/dm/impls/da/dasub.c.html#DMDAGetRay">src/dm/impls/da/dasub.c</A>
<BR><A HREF="./index.html">Index of all DM routines</A>
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