1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
|
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML3.2 EN">
<HTML>
<HEAD>
<META NAME="GENERATOR" CONTENT="DOCTEXT">
<TITLE>VecGetArray2d</TITLE>
</HEAD>
<BODY BGCOLOR="FFFFFF">
<A NAME="VecGetArray2d"><H1>VecGetArray2d</H1></A>
Returns a pointer to a 2d contiguous array that contains this processor's portion of the vector data. You MUST call <A HREF="../Vec/VecRestoreArray2d.html#VecRestoreArray2d">VecRestoreArray2d</A>() when you no longer need access to the array.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscvec.h"
int VecGetArray2d(Vec x,int m,int n,int mstart,int nstart,PetscScalar **a[])
</PRE>
Not 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 two dimensional array
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>n </B></TD><TD>- second dimension of two 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></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="../DA/DACreateLocalVector.html#DACreateLocalVector">DACreateLocalVector</A>() mstart and nstart are likely
obtained from the corner indices obtained from <A HREF="../DA/DAGetGhostCorners.html#DAGetGhostCorners">DAGetGhostCorners</A>() while for
<A HREF="../DA/DACreateGlobalVector.html#DACreateGlobalVector">DACreateGlobalVector</A>() they are the corner indices from <A HREF="../DA/DAGetCorners.html#DAGetCorners">DAGetCorners</A>(). In both cases
the arguments from DAGet[Ghost}Corners() are reversed in the call to <A HREF="../Vec/VecGetArray2d.html#VecGetArray2d">VecGetArray2d</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>(), DAVecGetarray(), <A HREF="../DA/DAVecRestoreArray.html#DAVecRestoreArray">DAVecRestoreArray</A>(), <A HREF="../Vec/VecGetArray3d.html#VecGetArray3d">VecGetArray3d</A>(), <A HREF="../Vec/VecRestoreArray3d.html#VecRestoreArray3d">VecRestoreArray3d</A>(),
VecGetarray1d(), <A HREF="../Vec/VecRestoreArray1d.html#VecRestoreArray1d">VecRestoreArray1d</A>(), VecGetArray4d(), VecRestoreArray4d()
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>beginner
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/vec/interface/vector.c.html#VecGetArray2d">src/vec/interface/vector.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>
</BODY></HTML>
|
