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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="VecScatterCreateLocal"><H1>VecScatterCreateLocal</H1></A>
Creates a <A HREF="../Vec/VecScatter.html#VecScatter">VecScatter</A> from a list of messages it must send and receive.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscvec.h"
PetscErrorCode VecScatterCreateLocal(VecScatter ctx,PetscInt nsends,const PetscInt sendSizes[],const PetscInt sendProcs[],const PetscInt sendIdx[],PetscInt nrecvs,const PetscInt recvSizes[],const PetscInt recvProcs[],const PetscInt recvIdx[],PetscInt bs)
</PRE>
Collective on <A HREF="../Vec/VecScatter.html#VecScatter">VecScatter</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><A HREF="../Vec/VecScatter.html#VecScatter">VecScatter</A> </B></TD><TD>- obtained with VecScatterCreateEmpty()
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>nsends </B></TD><TD>-
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>sendSizes </B></TD><TD>-
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>sendProcs </B></TD><TD>-
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>sendIdx </B></TD><TD>- indices where the sent entries are obtained from (in local, on process numbering), this is one long array of size \sum_{i=0,i<nsends} sendSizes[i]
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>nrecvs </B></TD><TD>- number of receives to expect
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>recvSizes </B></TD><TD>-
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>recvProcs </B></TD><TD>- processes who are sending to me
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>recvIdx </B></TD><TD>- indices of where received entries are to be put, (in local, on process numbering), this is one long array of size \sum_{i=0,i<nrecvs} recvSizes[i]
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>bs </B></TD><TD>- size of block
</TD></TR></TABLE>
<P>
Notes: sendSizes[] and recvSizes[] cannot have any 0 entries. If you want to support having 0 entries you need
to change the code below to "compress out" the sendProcs[] and recvProcs[] entries that have 0 entries.
<P>
Probably does not handle sends to self properly. It should remove those from the counts that are used
in allocating space inside of the from struct
<P>
<P>
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>intermediate
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/vec/vec/utils/vpscat.c.html#VecScatterCreateLocal">src/vec/vec/utils/vpscat.c</A>
<BR><A HREF="./index.html">Index of all Vec routines</A>
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