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<HTML>
<HEAD>
<TITLE>Preconditioners - PC</TITLE>
</HEAD>
<BODY BGCOLOR="FFFFFF">
<H2> Preconditioners - PC: <A HREF="../../../src/sles/examples/tutorials/index.html">Examples</A></H2>
The
<A HREF="../../../docs/manualpages/SLES/index.html">Scalable Linear Equations Solvers (SLES)</A>
component provides an easy-to-use interface to the combination of
a Krylov subspace iterative method and a preconditioner (in the
<A HREF="../../../docs/manualpages/KSP/index.html">KSP</A> and PC
components, respectively) or a sequential direct solver.
SLES users can set various preconditioning
options at runtime via the options database (e.g.,
<font face ="Courier">
-pc_type jacobi
</font face>
).
SLES users can also set PC options directly in application
codes by first extracting the PC context from the SLES context via
<A HREF="../../../docs/manualpages/SLES/SLESGetPC.html">SLESGetPC()</A>
and then directly calling the PC routines listed below (e.g.,
<A HREF="../../../docs/manualpages/PC/PCSetType.html">PCSetType()</A>
).
PC components can be used directly to create and
destroy solvers; this is not needed for users but
is for library developers.
<P>
<P>
<TABLE>
</TR><TD WIDTH=250 COLSPAN="3"><B>Beginner - Basic usage</B></TD></TR>
<TD WIDTH=250><A HREF="./MGType.html">MGType</A></TD>
<TD WIDTH=250><A HREF="./PCCompositeType.html">PCCompositeType</A></TD>
<TD WIDTH=250><A HREF="./PCSide.html">PCSide</A></TD>
<TR>
<TD WIDTH=250><A HREF="./PC.html">PC</A></TD>
<TD WIDTH=250><A HREF="./PCMultiLevelBuildSolution.html">PCMultiLevelBuildSolution</A></TD>
<TD WIDTH=250><A HREF="./PCType.html">PCType</A></TD>
<TR>
<TD WIDTH=250><A HREF="./PCASMType.html">PCASMType</A></TD>
<TD WIDTH=250><A HREF="./PCMultiLevelBukldSolution.html">PCMultiLevelBukldSolution</A></TD>
<TD WIDTH=250><A HREF="./"></A></TD>
<TR>
</TR><TD WIDTH=250 COLSPAN="3"><B>Intermediate - Setting options for algorithms and data structures</B></TD></TR>
<TD WIDTH=250><A HREF="./MGSetLevels.html">MGSetLevels</A></TD>
<TD WIDTH=250><A HREF="./PCILUDTSetReuseFill.html">PCILUDTSetReuseFill</A></TD>
<TD WIDTH=250><A HREF="./PCMultiLevelApplyGradientTrans.html">PCMultiLevelApplyGradientTrans</A></TD>
<TR>
<TD WIDTH=250><A HREF="./PCASMSetOverlap.html">PCASMSetOverlap</A></TD>
<TD WIDTH=250><A HREF="./PCILUSetAllowDiagonalFill.html">PCILUSetAllowDiagonalFill</A></TD>
<TD WIDTH=250><A HREF="./PCMultiLevelApplyP.html">PCMultiLevelApplyP</A></TD>
<TR>
<TD WIDTH=250><A HREF="./PCASMSetType.html">PCASMSetType</A></TD>
<TD WIDTH=250><A HREF="./PCILUSetDamping.html">PCILUSetDamping</A></TD>
<TD WIDTH=250><A HREF="./PCMultiLevelApplyP1.html">PCMultiLevelApplyP1</A></TD>
<TR>
<TD WIDTH=250><A HREF="./PCASMSetUseInPlace.html">PCASMSetUseInPlace</A></TD>
<TD WIDTH=250><A HREF="./PCILUSetFill.html">PCILUSetFill</A></TD>
<TD WIDTH=250><A HREF="./PCMultiLevelApplyP1Trans.html">PCMultiLevelApplyP1Trans</A></TD>
<TR>
<TD WIDTH=250><A HREF="./PCBJacobiSetLocalBlocks.html">PCBJacobiSetLocalBlocks</A></TD>
<TD WIDTH=250><A HREF="./PCILUSetLevels.html">PCILUSetLevels</A></TD>
<TD WIDTH=250><A HREF="./PCMultiLevelApplyP2.html">PCMultiLevelApplyP2</A></TD>
<TR>
<TD WIDTH=250><A HREF="./PCBJacobiSetTotalBlocks.html">PCBJacobiSetTotalBlocks</A></TD>
<TD WIDTH=250><A HREF="./PCILUSetMatOrdering.html">PCILUSetMatOrdering</A></TD>
<TD WIDTH=250><A HREF="./PCMultiLevelApplyP2Trans.html">PCMultiLevelApplyP2Trans</A></TD>
<TR>
<TD WIDTH=250><A HREF="./PCBJacobiSetUseTrueLocal.html">PCBJacobiSetUseTrueLocal</A></TD>
<TD WIDTH=250><A HREF="./PCILUSetPivotInBlocks.html">PCILUSetPivotInBlocks</A></TD>
<TD WIDTH=250><A HREF="./PCMultiLevelApplyPTrans.html">PCMultiLevelApplyPTrans</A></TD>
<TR>
<TD WIDTH=250><A HREF="./PCCholeskySetDamping.html">PCCholeskySetDamping</A></TD>
<TD WIDTH=250><A HREF="./PCILUSetReuseOrdering.html">PCILUSetReuseOrdering</A></TD>
<TD WIDTH=250><A HREF="./PCMultiLevelApplyV.html">PCMultiLevelApplyV</A></TD>
<TR>
<TD WIDTH=250><A HREF="./PCCholeskySetFill.html">PCCholeskySetFill</A></TD>
<TD WIDTH=250><A HREF="./PCILUSetSinglePrecisionSolves.html">PCILUSetSinglePrecisionSolves</A></TD>
<TD WIDTH=250><A HREF="./PCMultiLevelApplyVTrans.html">PCMultiLevelApplyVTrans</A></TD>
<TR>
<TD WIDTH=250><A HREF="./PCCholeskySetMatOrdering.html">PCCholeskySetMatOrdering</A></TD>
<TD WIDTH=250><A HREF="./PCILUSetUseDropTolerance.html">PCILUSetUseDropTolerance</A></TD>
<TD WIDTH=250><A HREF="./PCMultiLevelReduce.html">PCMultiLevelReduce</A></TD>
<TR>
<TD WIDTH=250><A HREF="./PCCholeskySetReuseFill.html">PCCholeskySetReuseFill</A></TD>
<TD WIDTH=250><A HREF="./PCILUSetUseInPlace.html">PCILUSetUseInPlace</A></TD>
<TD WIDTH=250><A HREF="./PCMultiLevelSetFields.html">PCMultiLevelSetFields</A></TD>
<TR>
<TD WIDTH=250><A HREF="./PCCholeskySetReuseOrdering.html">PCCholeskySetReuseOrdering</A></TD>
<TD WIDTH=250><A HREF="./PCJacobiSetUseRowMax.html">PCJacobiSetUseRowMax</A></TD>
<TD WIDTH=250><A HREF="./PCMultiLevelSetGradientOperator.html">PCMultiLevelSetGradientOperator</A></TD>
<TR>
<TD WIDTH=250><A HREF="./PCCholeskySetUseInPlace.html">PCCholeskySetUseInPlace</A></TD>
<TD WIDTH=250><A HREF="./PCLUSetDamping.html">PCLUSetDamping</A></TD>
<TD WIDTH=250><A HREF="./PCMultiLevelSetNonlinearIterate.html">PCMultiLevelSetNonlinearIterate</A></TD>
<TR>
<TD WIDTH=250><A HREF="./PCDiagonalScaleLeft.html">PCDiagonalScaleLeft</A></TD>
<TD WIDTH=250><A HREF="./PCLUSetFill.html">PCLUSetFill</A></TD>
<TD WIDTH=250><A HREF="./PCSORSetIterations.html">PCSORSetIterations</A></TD>
<TR>
<TD WIDTH=250><A HREF="./PCDiagonalScaleRight.html">PCDiagonalScaleRight</A></TD>
<TD WIDTH=250><A HREF="./PCLUSetMatOrdering.html">PCLUSetMatOrdering</A></TD>
<TD WIDTH=250><A HREF="./PCSORSetOmega.html">PCSORSetOmega</A></TD>
<TR>
<TD WIDTH=250><A HREF="./PCDiagonalScaleSet.html">PCDiagonalScaleSet</A></TD>
<TD WIDTH=250><A HREF="./PCLUSetPivotInBlocks.html">PCLUSetPivotInBlocks</A></TD>
<TD WIDTH=250><A HREF="./PCSORSetSymmetric.html">PCSORSetSymmetric</A></TD>
<TR>
<TD WIDTH=250><A HREF="./PCESISetType.html">PCESISetType</A></TD>
<TD WIDTH=250><A HREF="./PCLUSetPivoting.html">PCLUSetPivoting</A></TD>
<TD WIDTH=250><A HREF="./PCSchurGetIterationNumber.html">PCSchurGetIterationNumber</A></TD>
<TR>
<TD WIDTH=250><A HREF="./PCEisenstatNoDiagonalScaling.html">PCEisenstatNoDiagonalScaling</A></TD>
<TD WIDTH=250><A HREF="./PCLUSetReuseFill.html">PCLUSetReuseFill</A></TD>
<TD WIDTH=250><A HREF="./PCSchurInnerMonitor.html">PCSchurInnerMonitor</A></TD>
<TR>
<TD WIDTH=250><A HREF="./PCEisenstatSetOmega.html">PCEisenstatSetOmega</A></TD>
<TD WIDTH=250><A HREF="./PCLUSetReuseOrdering.html">PCLUSetReuseOrdering</A></TD>
<TD WIDTH=250><A HREF="./PCSchurMonitor.html">PCSchurMonitor</A></TD>
<TR>
<TD WIDTH=250><A HREF="./PCGetType.html">PCGetType</A></TD>
<TD WIDTH=250><A HREF="./PCLUSetUseInPlace.html">PCLUSetUseInPlace</A></TD>
<TD WIDTH=250><A HREF="./PCSchurSetGradientOperator.html">PCSchurSetGradientOperator</A></TD>
<TR>
<TD WIDTH=250><A HREF="./PCICCSetFill.html">PCICCSetFill</A></TD>
<TD WIDTH=250><A HREF="./PCMultiLevelApplyDInv.html">PCMultiLevelApplyDInv</A></TD>
<TD WIDTH=250><A HREF="./PCSchurSolveMonitor.html">PCSchurSolveMonitor</A></TD>
<TR>
<TD WIDTH=250><A HREF="./PCICCSetLevels.html">PCICCSetLevels</A></TD>
<TD WIDTH=250><A HREF="./PCMultiLevelApplyDInvTrans.html">PCMultiLevelApplyDInvTrans</A></TD>
<TD WIDTH=250><A HREF="./PCSetType.html">PCSetType</A></TD>
<TR>
<TD WIDTH=250><A HREF="./PCICCSetMatOrdering.html">PCICCSetMatOrdering</A></TD>
<TD WIDTH=250><A HREF="./PCMultiLevelApplyGradient.html">PCMultiLevelApplyGradient</A></TD>
<TD WIDTH=250><A HREF="./"></A></TD>
<TR>
</TR><TD WIDTH=250 COLSPAN="3"><B>Advanced - Setting more advanced options and customization</B></TD></TR>
<TD WIDTH=250><A HREF="./MGCheck.html">MGCheck</A></TD>
<TD WIDTH=250><A HREF="./MGSetRestriction.html">MGSetRestriction</A></TD>
<TD WIDTH=250><A HREF="./PCGetFactoredMatrix.html">PCGetFactoredMatrix</A></TD>
<TR>
<TD WIDTH=250><A HREF="./MGDefaultResidual.html">MGDefaultResidual</A></TD>
<TD WIDTH=250><A HREF="./MGSetRhs.html">MGSetRhs</A></TD>
<TD WIDTH=250><A HREF="./PCGetOptionsPrefix.html">PCGetOptionsPrefix</A></TD>
<TR>
<TD WIDTH=250><A HREF="./MGGetCoarseSolve.html">MGGetCoarseSolve</A></TD>
<TD WIDTH=250><A HREF="./MGSetType.html">MGSetType</A></TD>
<TD WIDTH=250><A HREF="./PCRedundantGetOperators.html">PCRedundantGetOperators</A></TD>
<TR>
<TD WIDTH=250><A HREF="./MGGetLevels.html">MGGetLevels</A></TD>
<TD WIDTH=250><A HREF="./MGSetX.html">MGSetX</A></TD>
<TD WIDTH=250><A HREF="./PCRedundantGetPC.html">PCRedundantGetPC</A></TD>
<TR>
<TD WIDTH=250><A HREF="./MGGetSmoother.html">MGGetSmoother</A></TD>
<TD WIDTH=250><A HREF="./PCASMCreateSubdomains2D.html">PCASMCreateSubdomains2D</A></TD>
<TD WIDTH=250><A HREF="./PCRedundantSetScatter.html">PCRedundantSetScatter</A></TD>
<TR>
<TD WIDTH=250><A HREF="./MGGetSmootherDown.html">MGGetSmootherDown</A></TD>
<TD WIDTH=250><A HREF="./PCASMGetLocalSubdomains.html">PCASMGetLocalSubdomains</A></TD>
<TD WIDTH=250><A HREF="./PCRegisterAll.html">PCRegisterAll</A></TD>
<TR>
<TD WIDTH=250><A HREF="./MGGetSmootherUp.html">MGGetSmootherUp</A></TD>
<TD WIDTH=250><A HREF="./PCASMGetLocalSubmatrices.html">PCASMGetLocalSubmatrices</A></TD>
<TD WIDTH=250><A HREF="./PCRegisterDestroy.html">PCRegisterDestroy</A></TD>
<TR>
<TD WIDTH=250><A HREF="./MGSetCycles.html">MGSetCycles</A></TD>
<TD WIDTH=250><A HREF="./PCASMGetSubSLES.html">PCASMGetSubSLES</A></TD>
<TD WIDTH=250><A HREF="./PCRegisterDynamic.html">PCRegisterDynamic</A></TD>
<TR>
<TD WIDTH=250><A HREF="./MGSetCyclesOnLevel.html">MGSetCyclesOnLevel</A></TD>
<TD WIDTH=250><A HREF="./PCASMSetLocalSubdomains.html">PCASMSetLocalSubdomains</A></TD>
<TD WIDTH=250><A HREF="./PCSLESGetSLES.html">PCSLESGetSLES</A></TD>
<TR>
<TD WIDTH=250><A HREF="./MGSetInterpolate.html">MGSetInterpolate</A></TD>
<TD WIDTH=250><A HREF="./PCASMSetTotalSubdomains.html">PCASMSetTotalSubdomains</A></TD>
<TD WIDTH=250><A HREF="./PCSLESSetUseTrue.html">PCSLESSetUseTrue</A></TD>
<TR>
<TD WIDTH=250><A HREF="./MGSetNumberSmoothDown.html">MGSetNumberSmoothDown</A></TD>
<TD WIDTH=250><A HREF="./PCAppendOptionsPrefix.html">PCAppendOptionsPrefix</A></TD>
<TD WIDTH=250><A HREF="./PCSetModifySubMatrices.html">PCSetModifySubMatrices</A></TD>
<TR>
<TD WIDTH=250><A HREF="./MGSetNumberSmoothUp.html">MGSetNumberSmoothUp</A></TD>
<TD WIDTH=250><A HREF="./PCBJacobiGetSubSLES.html">PCBJacobiGetSubSLES</A></TD>
<TD WIDTH=250><A HREF="./PCSetOptionsPrefix.html">PCSetOptionsPrefix</A></TD>
<TR>
<TD WIDTH=250><A HREF="./MGSetR.html">MGSetR</A></TD>
<TD WIDTH=250><A HREF="./PCComputeExplicitOperator.html">PCComputeExplicitOperator</A></TD>
<TD WIDTH=250><A HREF="./"></A></TD>
<TR>
<TD WIDTH=250><A HREF="./MGSetResidual.html">MGSetResidual</A></TD>
<TD WIDTH=250><A HREF="./PCESISetPreconditioner.html">PCESISetPreconditioner</A></TD>
<TD WIDTH=250><A HREF="./"></A></TD>
<TR>
</TR><TD WIDTH=250 COLSPAN="3"><B>Developer - Interfaces intended primarily for library developers, not for typical applications programmers</B></TD></TR>
<TD WIDTH=250><A HREF="./PCApply.html">PCApply</A></TD>
<TD WIDTH=250><A HREF="./PCCompositeSpecialSetAlpha.html">PCCompositeSpecialSetAlpha</A></TD>
<TD WIDTH=250><A HREF="./PCSetOperators.html">PCSetOperators</A></TD>
<TR>
<TD WIDTH=250><A HREF="./PCApplyBAorAB.html">PCApplyBAorAB</A></TD>
<TD WIDTH=250><A HREF="./PCCreate.html">PCCreate</A></TD>
<TD WIDTH=250><A HREF="./PCSetUp.html">PCSetUp</A></TD>
<TR>
<TD WIDTH=250><A HREF="./PCApplyBAorABTranspose.html">PCApplyBAorABTranspose</A></TD>
<TD WIDTH=250><A HREF="./PCDestroy.html">PCDestroy</A></TD>
<TD WIDTH=250><A HREF="./PCSetUpOnBlocks.html">PCSetUpOnBlocks</A></TD>
<TR>
<TD WIDTH=250><A HREF="./PCApplyRichardson.html">PCApplyRichardson</A></TD>
<TD WIDTH=250><A HREF="./PCDiagonalScale.html">PCDiagonalScale</A></TD>
<TD WIDTH=250><A HREF="./PCSetVector.html">PCSetVector</A></TD>
<TR>
<TD WIDTH=250><A HREF="./PCApplyRichardsonExists.html">PCApplyRichardsonExists</A></TD>
<TD WIDTH=250><A HREF="./PCGetOperators.html">PCGetOperators</A></TD>
<TD WIDTH=250><A HREF="./PCShellGetName.html">PCShellGetName</A></TD>
<TR>
<TD WIDTH=250><A HREF="./PCApplySymmetricLeft.html">PCApplySymmetricLeft</A></TD>
<TD WIDTH=250><A HREF="./PCGetVector.html">PCGetVector</A></TD>
<TD WIDTH=250><A HREF="./PCShellSetApply.html">PCShellSetApply</A></TD>
<TR>
<TD WIDTH=250><A HREF="./PCApplySymmetricRight.html">PCApplySymmetricRight</A></TD>
<TD WIDTH=250><A HREF="./PCModifySubMatrices.html">PCModifySubMatrices</A></TD>
<TD WIDTH=250><A HREF="./PCShellSetApplyRichardson.html">PCShellSetApplyRichardson</A></TD>
<TR>
<TD WIDTH=250><A HREF="./PCApplyTranspose.html">PCApplyTranspose</A></TD>
<TD WIDTH=250><A HREF="./PCMultiLevelInitializePackage.html">PCMultiLevelInitializePackage</A></TD>
<TD WIDTH=250><A HREF="./PCShellSetApplyTranspose.html">PCShellSetApplyTranspose</A></TD>
<TR>
<TD WIDTH=250><A HREF="./PCCompositeAddPC.html">PCCompositeAddPC</A></TD>
<TD WIDTH=250><A HREF="./PCNullSpaceAttach.html">PCNullSpaceAttach</A></TD>
<TD WIDTH=250><A HREF="./PCShellSetName.html">PCShellSetName</A></TD>
<TR>
<TD WIDTH=250><A HREF="./PCCompositeGetPC.html">PCCompositeGetPC</A></TD>
<TD WIDTH=250><A HREF="./PCPostSolve.html">PCPostSolve</A></TD>
<TD WIDTH=250><A HREF="./PCShellSetSetUp.html">PCShellSetSetUp</A></TD>
<TR>
<TD WIDTH=250><A HREF="./PCCompositeSetType.html">PCCompositeSetType</A></TD>
<TD WIDTH=250><A HREF="./PCPreSolve.html">PCPreSolve</A></TD>
<TD WIDTH=250><A HREF="./PCShellSetView.html">PCShellSetView</A></TD>
<TR>
<TD WIDTH=250><A HREF="./PCCompositeSetUseTrue.html">PCCompositeSetUseTrue</A></TD>
<TD WIDTH=250><A HREF="./PCSetFromOptions.html">PCSetFromOptions</A></TD>
<TD WIDTH=250><A HREF="./PCView.html">PCView</A></TD>
<TR>
</TABLE>
<BR><A HREF="../../index.html"><IMG SRC="../up.gif">Table of Contents</A>
|
