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<A NAME="MatSetValues"><H1>MatSetValues</H1></A>
Inserts or adds a block of values into a matrix. These values may be cached, so <A HREF="../Mat/MatAssemblyBegin.html#MatAssemblyBegin">MatAssemblyBegin</A>() and <A HREF="../Mat/MatAssemblyEnd.html#MatAssemblyEnd">MatAssemblyEnd</A>() MUST be called after all calls to <A HREF="../Mat/MatSetValues.html#MatSetValues">MatSetValues</A>() have been completed.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscmat.h"
int MatSetValues(Mat mat,int m,const int idxm[],int n,const int idxn[],const PetscScalar v[],InsertMode addv)
</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>mat </B></TD><TD>- the matrix
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>v </B></TD><TD>- a logically two-dimensional array of values
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>m, idxm </B></TD><TD>- the number of rows and their global indices
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>n, idxn </B></TD><TD>- the number of columns and their global indices
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>addv </B></TD><TD>- either ADD_VALUES or INSERT_VALUES, where
ADD_VALUES adds values to any existing entries, and
INSERT_VALUES replaces existing entries with new values
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
By default the values, v, are row-oriented and unsorted.
See <A HREF="../Mat/MatSetOption.html#MatSetOption">MatSetOption</A>() for other options.
<P>
Calls to <A HREF="../Mat/MatSetValues.html#MatSetValues">MatSetValues</A>() with the INSERT_VALUES and ADD_VALUES
options cannot be mixed without intervening calls to the assembly
routines.
<P>
<A HREF="../Mat/MatSetValues.html#MatSetValues">MatSetValues</A>() uses 0-based row and column numbers in Fortran
as well as in C.
<P>
Negative indices may be passed in idxm and idxn, these rows and columns are
simply ignored. This allows easily inserting element stiffness matrices
with homogeneous Dirchlet boundary conditions that you don't want represented
in the matrix.
<P>
<H3><FONT COLOR="#CC3333">Efficiency Alert</FONT></H3>
The routine <A HREF="../Mat/MatSetValuesBlocked.html#MatSetValuesBlocked">MatSetValuesBlocked</A>() may offer much better efficiency
for users of block sparse formats (<A HREF="../Mat/MATSEQBAIJ.html#MATSEQBAIJ">MATSEQBAIJ</A> and <A HREF="../Mat/MATMPIBAIJ.html#MATMPIBAIJ">MATMPIBAIJ</A>).
<P>
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Mat/MatSetOption.html#MatSetOption">MatSetOption</A>(), <A HREF="../Mat/MatAssemblyBegin.html#MatAssemblyBegin">MatAssemblyBegin</A>(), <A HREF="../Mat/MatAssemblyEnd.html#MatAssemblyEnd">MatAssemblyEnd</A>(), <A HREF="../Mat/MatSetValuesBlocked.html#MatSetValuesBlocked">MatSetValuesBlocked</A>(), <A HREF="../Mat/MatSetValuesLocal.html#MatSetValuesLocal">MatSetValuesLocal</A>()
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>beginner
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/mat/interface/matrix.c.html#MatSetValues">src/mat/interface/matrix.c</A>
<BR><A HREF="./index.html">Index of all Mat routines</A>
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<P><H3><FONT COLOR="#CC3333">Examples</FONT></H3>
<A HREF="../../../src/mat/examples/tutorials/ex2.c.html">src/mat/examples/tutorials/ex2.c.html</A><BR>
<A HREF="../../../src/ksp/pc/examples/tutorials/ex1.c.html">src/ksp/pc/examples/tutorials/ex1.c.html</A><BR>
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