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<div id="version" align=right><b>petsc-3.4.2 2013-07-02</b></div>
<A NAME="VecGetArrayRead"><H1>VecGetArrayRead</H1></A>
Get read-only pointer to contiguous array containing this processor's portion of the vector data.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscvec.h"
PetscErrorCode VecGetArrayRead(Vec x,const PetscScalar **a)
</PRE>
Not Collective
<P>
<H3><FONT COLOR="#CC3333">Input Parameters</FONT></H3>
<DT><B>x </B> -the vector
<br>
<P>
<H3><FONT COLOR="#CC3333">Output Parameter</FONT></H3>
<DT><B>a </B> -the array
<br>
<P>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
The array must be returned using a matching call to <A HREF="../Vec/VecRestoreArrayRead.html#VecRestoreArrayRead">VecRestoreArrayRead</A>().
<P>
Unlike <A HREF="../Vec/VecGetArray.html#VecGetArray">VecGetArray</A>(), this routine is not collective and preserves cached information like vector norms.
<P>
Standard PETSc vectors use contiguous storage so that this routine does not perform a copy. Other vector
implementations may require a copy, but must such implementations should cache the contiguous representation so that
only one copy is performed when this routine is called multiple times in sequence.
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Vec/VecGetArray.html#VecGetArray">VecGetArray</A>(), <A HREF="../Vec/VecRestoreArray.html#VecRestoreArray">VecRestoreArray</A>()
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>beginner
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/vec/vec/interface/rvector.c.html#VecGetArrayRead">src/vec/vec/interface/rvector.c</A>
<BR><A HREF="./index.html">Index of all Vec 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>
<P><H3><FONT COLOR="#CC3333">Examples</FONT></H3>
<A HREF="../../../src/snes/examples/tutorials/ex1.c.html">src/snes/examples/tutorials/ex1.c.html</A><BR>
<A HREF="../../../src/snes/examples/tutorials/ex2.c.html">src/snes/examples/tutorials/ex2.c.html</A><BR>
<A HREF="../../../src/snes/examples/tutorials/ex31.c.html">src/snes/examples/tutorials/ex31.c.html</A><BR>
<A HREF="../../../src/snes/examples/tutorials/ex54.c.html">src/snes/examples/tutorials/ex54.c.html</A><BR>
<A HREF="../../../src/snes/examples/tutorials/ex55.c.html">src/snes/examples/tutorials/ex55.c.html</A><BR>
<A HREF="../../../src/snes/examples/tutorials/ex61.c.html">src/snes/examples/tutorials/ex61.c.html</A><BR>
<A HREF="../../../src/snes/examples/tutorials/ex63.c.html">src/snes/examples/tutorials/ex63.c.html</A><BR>
<A HREF="../../../src/snes/examples/tutorials/ex633d_db.c.html">src/snes/examples/tutorials/ex633d_db.c.html</A><BR>
<A HREF="../../../src/snes/examples/tutorials/ex64.c.html">src/snes/examples/tutorials/ex64.c.html</A><BR>
<A HREF="../../../src/snes/examples/tutorials/ex65.c.html">src/snes/examples/tutorials/ex65.c.html</A><BR>
<A HREF="../../../src/ts/examples/tutorials/ex16.c.html">src/ts/examples/tutorials/ex16.c.html</A><BR>
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