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<div id="version" align=right><b>petsc-3.7.5 2017-01-01</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-3.7.5 v3.7.5 docs/manualpages/Vec/VecGetValues.html "><small>Report Typos and Errors</small></a></div>
<A NAME="VecGetValues"><H1>VecGetValues</H1></A>
Gets values from certain locations of a vector. Currently can only get values on the same processor
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscvec.h"
PetscErrorCode VecGetValues(Vec x,PetscInt ni,const PetscInt ix[],PetscScalar y[])
</PRE>
Not Collective
<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>x </B></TD><TD>- vector to get values from
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ni </B></TD><TD>- number of elements to get
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ix </B></TD><TD>- indices where to get them from (in global 1d numbering)
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Output Parameter</FONT></H3>
<DT><B>y </B> -array of values
<br>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
The user provides the allocated array y; it is NOT allocated in this routine
<P>
<A HREF="../Vec/VecGetValues.html#VecGetValues">VecGetValues</A>() gets y[i] = x[ix[i]], for i=0,...,ni-1.
<P>
<A HREF="../Vec/VecAssemblyBegin.html#VecAssemblyBegin">VecAssemblyBegin</A>() and <A HREF="../Vec/VecAssemblyEnd.html#VecAssemblyEnd">VecAssemblyEnd</A>() MUST be called before calling this
<P>
<A HREF="../Vec/VecGetValues.html#VecGetValues">VecGetValues</A>() uses 0-based indices in Fortran as well as in C.
<P>
If you call <A HREF="../Vec/VecSetOption.html#VecSetOption">VecSetOption</A>(x, VEC_IGNORE_NEGATIVE_INDICES,<A HREF="../Sys/PETSC_TRUE.html#PETSC_TRUE">PETSC_TRUE</A>),
negative indices may be passed in ix. These rows are
simply ignored.
<P>
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Vec/VecAssemblyBegin.html#VecAssemblyBegin">VecAssemblyBegin</A>(), <A HREF="../Vec/VecAssemblyEnd.html#VecAssemblyEnd">VecAssemblyEnd</A>(), <A HREF="../Vec/VecSetValues.html#VecSetValues">VecSetValues</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#VecGetValues">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>
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