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<A NAME="MATIS"><H1>MATIS</H1></A>
<A HREF="../Mat/MATIS.html#MATIS">MATIS</A> = "is" - A matrix type to be used for using the Neumann-Neumann type preconditioners. This stores the matrices in globally unassembled form. Each processor assembles only its local Neumann problem and the parallel matrix vector product is handled "implicitly".
<H3><FONT COLOR="#CC3333">Operations Provided</FONT></H3>
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<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B><A HREF="../Mat/MatMult.html#MatMult">MatMult</A>()</B></TD><TD>- . <A HREF="../Mat/MatZeroEntries.html#MatZeroEntries">MatZeroEntries</A>()
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B><A HREF="../Mat/MatSetOption.html#MatSetOption">MatSetOption</A>()</B></TD><TD>- . <A HREF="../Mat/MatZeroRowsLocal.html#MatZeroRowsLocal">MatZeroRowsLocal</A>()
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B><A HREF="../Mat/MatSetValuesLocal.html#MatSetValuesLocal">MatSetValuesLocal</A>()</B></TD><TD>- - <A HREF="../Mat/MatSetLocalToGlobalMapping.html#MatSetLocalToGlobalMapping">MatSetLocalToGlobalMapping</A>()
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<P>
<H3><FONT COLOR="#CC3333">Options Database Keys</FONT></H3>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-mat_type is </B></TD><TD>- sets the matrix type to "is" during a call to <A HREF="../Mat/MatSetFromOptions.html#MatSetFromOptions">MatSetFromOptions</A>()
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<P>
Notes: Options prefix for the inner matrix are given by -is_mat_xxx
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You must call <A HREF="../Mat/MatSetLocalToGlobalMapping.html#MatSetLocalToGlobalMapping">MatSetLocalToGlobalMapping</A>() before using this matrix type.
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You can do matrix preallocation on the local matrix after you obtain it with
<A HREF="../Mat/MatISGetLocalMat.html#MatISGetLocalMat">MatISGetLocalMat</A>()
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<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../PC/PC.html#PC">PC</A>, <A HREF="../Mat/MatISGetLocalMat.html#MatISGetLocalMat">MatISGetLocalMat</A>(), <A HREF="../Mat/MatSetLocalToGlobalMapping.html#MatSetLocalToGlobalMapping">MatSetLocalToGlobalMapping</A>()
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<P>
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>advanced
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/mat/impls/is/matis.c.html#MATIS">src/mat/impls/is/matis.c</A>
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