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<A NAME="PCML"><H1>PCML</H1></A>
Use algebraic multigrid preconditioning. This preconditioner requires you provide fine grid discretization matrix. The coarser grid matrices and restriction/interpolation operators are computed by ML, with the matrices coverted to PETSc matrices in aij format and the restriction/interpolation operators wrapped as PETSc shell matrices.
<H3><FONT COLOR="#CC3333">Options Database Key</FONT></H3>
Multigrid options(inherited)
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_mg_cycles <1>: 1 for V cycle, 2 for W</B></TD><TD>- cycle (MGSetCycles)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_mg_smoothup <1>: Number of post</B></TD><TD>- smoothing steps (MGSetNumberSmoothUp)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_mg_smoothdown <1>: Number of pre</B></TD><TD>- smoothing steps (MGSetNumberSmoothDown)
-pc_mg_type <multiplicative>: (one of) additive multiplicative full cascade kascade
ML options:
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_ml_PrintLevel <0>: Print level (ML_Set_PrintLevel)</B></TD><TD>- . -pc_ml_maxNlevels <10>: Maximum number of levels (None)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_ml_maxCoarseSize <1>: Maximum coarsest mesh size (ML_Aggregate_Set_MaxCoarseSize)</B></TD><TD>- . -pc_ml_CoarsenScheme <Uncoupled>: (one of) Uncoupled Coupled MIS METIS
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_ml_DampingFactor <1.33333>: P damping factor (ML_Aggregate_Set_DampingFactor)</B></TD><TD>- . -pc_ml_Threshold <0>: Smoother drop tol (ML_Aggregate_Set_Threshold)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_ml_SpectralNormScheme_Anorm <false>: Method used for estimating spectral radius (ML_Set_SpectralNormScheme_Anorm)</B></TD><TD>-
</TD></TR></TABLE>
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../PC/PCCreate.html#PCCreate">PCCreate</A>(), <A HREF="../PC/PCSetType.html#PCSetType">PCSetType</A>(), <A HREF="../PC/PCType.html#PCType">PCType</A> (for list of available types), <A HREF="../PC/PC.html#PC">PC</A>, <A HREF="../PC/PCMGType.html#PCMGType">PCMGType</A>,
<BR><A HREF="../PC/PCMGSetLevels.html#PCMGSetLevels">PCMGSetLevels</A>(), <A HREF="../PC/PCMGGetLevels.html#PCMGGetLevels">PCMGGetLevels</A>(), <A HREF="../PC/PCMGSetType.html#PCMGSetType">PCMGSetType</A>(), MPSetCycles(), <A HREF="../PC/PCMGSetNumberSmoothDown.html#PCMGSetNumberSmoothDown">PCMGSetNumberSmoothDown</A>(),
<A HREF="../PC/PCMGSetNumberSmoothUp.html#PCMGSetNumberSmoothUp">PCMGSetNumberSmoothUp</A>(), <A HREF="../PC/PCMGGetCoarseSolve.html#PCMGGetCoarseSolve">PCMGGetCoarseSolve</A>(), <A HREF="../PC/PCMGSetResidual.html#PCMGSetResidual">PCMGSetResidual</A>(), <A HREF="../PC/PCMGSetInterpolation.html#PCMGSetInterpolation">PCMGSetInterpolation</A>(),
<A HREF="../PC/PCMGSetRestriction.html#PCMGSetRestriction">PCMGSetRestriction</A>(), <A HREF="../PC/PCMGGetSmoother.html#PCMGGetSmoother">PCMGGetSmoother</A>(), <A HREF="../PC/PCMGGetSmootherUp.html#PCMGGetSmootherUp">PCMGGetSmootherUp</A>(), <A HREF="../PC/PCMGGetSmootherDown.html#PCMGGetSmootherDown">PCMGGetSmootherDown</A>(),
<A HREF="../PC/PCMGSetCyclesOnLevel.html#PCMGSetCyclesOnLevel">PCMGSetCyclesOnLevel</A>(), <A HREF="../PC/PCMGSetRhs.html#PCMGSetRhs">PCMGSetRhs</A>(), <A HREF="../PC/PCMGSetX.html#PCMGSetX">PCMGSetX</A>(), <A HREF="../PC/PCMGSetR.html#PCMGSetR">PCMGSetR</A>()
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>intermediate
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/ksp/pc/impls/ml/ml.c.html#PCML">src/ksp/pc/impls/ml/ml.c</A>
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