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<TITLE>ISGlobalToLocalMappingApplyBlock</TITLE>
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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/IS/ISGlobalToLocalMappingApplyBlock.html "><small>Report Typos and Errors</small></a></div>
<A NAME="ISGlobalToLocalMappingApplyBlock"><H1>ISGlobalToLocalMappingApplyBlock</H1></A>
Provides the local block numbering for a list of integers specified with a block global numbering.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscis.h"
PetscErrorCode ISGlobalToLocalMappingApplyBlock(ISLocalToGlobalMapping mapping,ISGlobalToLocalMappingType type,
PetscInt n,const PetscInt idx[],PetscInt *nout,PetscInt idxout[])
</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>mapping </B></TD><TD>- mapping between local and global numbering
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>type </B></TD><TD>- IS_GTOLM_MASK - replaces global indices with no local value with -1
IS_GTOLM_DROP - drops the indices with no local value from the output list
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>n </B></TD><TD>- number of global indices to map
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>idx </B></TD><TD>- global indices to map
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Output Parameters</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>nout </B></TD><TD>- number of indices in output array (if type == IS_GTOLM_MASK then nout = n)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>idxout </B></TD><TD>- local index of each global index, one must pass in an array long enough
to hold all the indices. You can call <A HREF="../IS/ISGlobalToLocalMappingApplyBlock.html#ISGlobalToLocalMappingApplyBlock">ISGlobalToLocalMappingApplyBlock</A>() with
idxout == NULL to determine the required length (returned in nout)
and then allocate the required space and call <A HREF="../IS/ISGlobalToLocalMappingApplyBlock.html#ISGlobalToLocalMappingApplyBlock">ISGlobalToLocalMappingApplyBlock</A>()
a second time to set the values.
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
Either nout or idxout may be NULL. idx and idxout may be identical.
<P>
This is not scalable in memory usage. Each processor requires O(Nglobal) size
array to compute these.
<P>
<P>
Developer Note: The manual page states that idx and idxout may be identical but the calling
sequence declares idx as const so it cannot be the same as idxout.
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../IS/ISLocalToGlobalMappingApply.html#ISLocalToGlobalMappingApply">ISLocalToGlobalMappingApply</A>(), <A HREF="../IS/ISGlobalToLocalMappingApply.html#ISGlobalToLocalMappingApply">ISGlobalToLocalMappingApply</A>(), <A HREF="../IS/ISLocalToGlobalMappingCreate.html#ISLocalToGlobalMappingCreate">ISLocalToGlobalMappingCreate</A>(),
<BR><A HREF="../IS/ISLocalToGlobalMappingDestroy.html#ISLocalToGlobalMappingDestroy">ISLocalToGlobalMappingDestroy</A>()
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>advanced
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/vec/is/utils/isltog.c.html#ISGlobalToLocalMappingApplyBlock">src/vec/is/utils/isltog.c</A>
<BR><A HREF="./index.html">Index of all IS 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/vec/is/is/examples/tutorials/ex5.c.html">src/vec/is/is/examples/tutorials/ex5.c.html</A><BR>
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