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<div id="version" align=right><b>petsc-3.4.2 2013-07-02</b></div>
<A NAME="MatZeroRowsColumnsLocal"><H1>MatZeroRowsColumnsLocal</H1></A>
Zeros all entries (except possibly the main diagonal) of a set of rows and columns of a matrix; using local numbering of rows.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscmat.h"
PetscErrorCode MatZeroRowsColumnsLocal(Mat mat,PetscInt numRows,const PetscInt rows[],PetscScalar diag,Vec x,Vec b)
</PRE>
Collective on <A HREF="../Mat/Mat.html#Mat">Mat</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>mat </B></TD><TD>- the matrix
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>numRows </B></TD><TD>- the number of rows to remove
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>rows </B></TD><TD>- the global row indices
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>diag </B></TD><TD>- value put in all diagonals of eliminated rows
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>x </B></TD><TD>- optional vector of solutions for zeroed rows (other entries in vector are not used)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>b </B></TD><TD>- optional vector of right hand side, that will be adjusted by provided solution
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
Before calling <A HREF="../Mat/MatZeroRowsColumnsLocal.html#MatZeroRowsColumnsLocal">MatZeroRowsColumnsLocal</A>(), the user must first set the
local-to-global mapping by calling <A HREF="../Mat/MatSetLocalToGlobalMapping.html#MatSetLocalToGlobalMapping">MatSetLocalToGlobalMapping</A>().
<P>
The user can set a value in the diagonal entry (or for the AIJ and
row formats can optionally remove the main diagonal entry from the
nonzero structure as well, by passing 0.0 as the final argument).
<P>
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Mat/MatZeroRows.html#MatZeroRows">MatZeroRows</A>(), <A HREF="../Mat/MatZeroRowsLocalIS.html#MatZeroRowsLocalIS">MatZeroRowsLocalIS</A>(), <A HREF="../Mat/MatZeroEntries.html#MatZeroEntries">MatZeroEntries</A>(), <A HREF="../Mat/MatZeroRows.html#MatZeroRows">MatZeroRows</A>(), <A HREF="../Mat/MatSetLocalToGlobalMapping.html#MatSetLocalToGlobalMapping">MatSetLocalToGlobalMapping</A>
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>intermediate
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/mat/interface/matrix.c.html#MatZeroRowsColumnsLocal">src/mat/interface/matrix.c</A>
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