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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="VecGetArray4d"><H1>VecGetArray4d</H1></A>
Returns a pointer to a 4d contiguous array that contains this processor's portion of the vector data. You MUST call <A HREF="../Vec/VecRestoreArray4d.html#VecRestoreArray4d">VecRestoreArray4d</A>() when you no longer need access to the array.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscvec.h"
PetscErrorCode VecGetArray4d(Vec x,PetscInt m,PetscInt n,PetscInt p,PetscInt q,PetscInt mstart,PetscInt nstart,PetscInt pstart,PetscInt qstart,PetscScalar ****a[])
</PRE>
Logically Collective
<P>
<H3><FONT COLOR="#CC3333">Input Parameter</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>x </B></TD><TD>- the vector
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>m </B></TD><TD>- first dimension of four dimensional array
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>n </B></TD><TD>- second dimension of four dimensional array
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>p </B></TD><TD>- third dimension of four dimensional array
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>q </B></TD><TD>- fourth dimension of four dimensional array
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>mstart </B></TD><TD>- first index you will use in first coordinate direction (often 0)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>nstart </B></TD><TD>- first index in the second coordinate direction (often 0)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>pstart </B></TD><TD>- first index in the third coordinate direction (often 0)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>qstart </B></TD><TD>- first index in the fourth coordinate direction (often 0)
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Output Parameter</FONT></H3>
<DT><B>a </B> -location to put pointer to the array
<br>
<P>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
For a vector obtained from <A HREF="../DM/DMCreateLocalVector.html#DMCreateLocalVector">DMCreateLocalVector</A>() mstart, nstart, and pstart are likely
obtained from the corner indices obtained from <A HREF="../DM/DMDAGetGhostCorners.html#DMDAGetGhostCorners">DMDAGetGhostCorners</A>() while for
<A HREF="../DM/DMCreateGlobalVector.html#DMCreateGlobalVector">DMCreateGlobalVector</A>() they are the corner indices from <A HREF="../DM/DMDAGetCorners.html#DMDAGetCorners">DMDAGetCorners</A>(). In both cases
the arguments from DMDAGet[Ghost]Corners() are reversed in the call to <A HREF="../Vec/VecGetArray3d.html#VecGetArray3d">VecGetArray3d</A>().
<P>
For standard PETSc vectors this is an inexpensive call; it does not copy the vector values.
<P>
<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>(), <A HREF="../Vec/VecGetArrays.html#VecGetArrays">VecGetArrays</A>(), <A HREF="../Vec/VecGetArrayF90.html#VecGetArrayF90">VecGetArrayF90</A>(), <A HREF="../Vec/VecPlaceArray.html#VecPlaceArray">VecPlaceArray</A>(),
<BR><A HREF="../Vec/VecRestoreArray2d.html#VecRestoreArray2d">VecRestoreArray2d</A>(), DMDAVecGetarray(), <A HREF="../DM/DMDAVecRestoreArray.html#DMDAVecRestoreArray">DMDAVecRestoreArray</A>(), <A HREF="../Vec/VecGetArray3d.html#VecGetArray3d">VecGetArray3d</A>(), <A HREF="../Vec/VecRestoreArray3d.html#VecRestoreArray3d">VecRestoreArray3d</A>(),
<A HREF="../Vec/VecGetArray1d.html#VecGetArray1d">VecGetArray1d</A>(), <A HREF="../Vec/VecRestoreArray1d.html#VecRestoreArray1d">VecRestoreArray1d</A>(), <A HREF="../Vec/VecGetArray4d.html#VecGetArray4d">VecGetArray4d</A>(), <A HREF="../Vec/VecRestoreArray4d.html#VecRestoreArray4d">VecRestoreArray4d</A>()
<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#VecGetArray4d">src/vec/vec/interface/rvector.c</A>
<BR><A HREF="./index.html">Index of all Vec routines</A>
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