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<TITLE>PCLUSetUseInPlace</TITLE>
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<A NAME="PCLUSetUseInPlace"><H1>PCLUSetUseInPlace</H1></A>
Tells the system to do an in-place factorization. For dense matrices, this enables the solution of much larger problems.  For sparse matrices the factorization cannot be done truly in-place  so this does not save memory during the factorization, but after the matrix is factored, the original unfactored matrix is freed, thus recovering that space. 
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscpc.h" 
int PCLUSetUseInPlace(PC pc)
</PRE>
Collective on <A HREF="../PC/PC.html#PC">PC</A>
<P>
<H3><FONT COLOR="#CC3333">Input Parameters</FONT></H3>
<DT><B>pc </B> -the preconditioner context
<br>
<P>
<H3><FONT COLOR="#CC3333">Options Database Key</FONT></H3>
<DT><B>-pc_lu_in_place </B> -Activates in-place factorization
<br>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
PCLUSetUseInplace() can only be used with the <A HREF="../KSP/KSP.html#KSP">KSP</A> method KSPPREONLY or when
a different matrix is provided for the multiply and the preconditioner in
a call to <A HREF="../SLES/SLESSetOperators.html#SLESSetOperators">SLESSetOperators</A>().
This is because the Krylov space methods require an application of the
matrix multiplication, which is not possible here because the matrix has
been factored in-place, replacing the original matrix.
<P>

<P>
<H3><FONT COLOR="#CC3333">Keywords</FONT></H3>
 <A HREF="../PC/PC.html#PC">PC</A>, set, factorization, direct, inplace, in-place, LU
<BR>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
 <A HREF="../PC/PCILUSetUseInPlace.html#PCILUSetUseInPlace">PCILUSetUseInPlace</A>()
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>intermediate
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/sles/pc/impls/lu/lu.c.html#PCLUSetUseInPlace">src/sles/pc/impls/lu/lu.c</A>
<BR><A HREF="./index.html">Index of all PC routines</A>
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