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<HTML>
<HEAD>
<TITLE>Krylov Methods - KSP</TITLE>
</HEAD>
<BODY BGCOLOR="FFFFFF">
<H2> Krylov Methods - KSP: : <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 KSP and
<A HREF="../../../docs/manualpages/PC/index.html">PC</A>
components, respectively) or a sequential direct solver. SLES users can set various Krylov
subspace options at runtime via the options database (e.g.,
<font face ="Courier">
-ksp_type cg
</font face>
).
SLES users can also set KSP options directly in application
codes by first extracting the KSP context from the SLES context via
<A HREF="../../../docs/manualpages/SLES/SLESGetKSP.html">SLESGetKSP()</A>
and then directly calling the KSP routines listed below (e.g.,
<A HREF="../../../docs/manualpages/KSP/KSPSetType.html">KSPSetType()</A>
).
KSP components can be used directly to create and
destroy solvers; this is not needed for users but
is intended for library developers.
<P>
<P>
<TABLE>
</TR><TD WIDTH=250 COLSPAN="3"><B>Beginner - Basic usage</B></TD></TR>
<TD WIDTH=250><A HREF="./KSP.html">KSP</A></TD>
<TD WIDTH=250><A HREF="./KSPConvergedReason.html">KSPConvergedReason</A></TD>
<TD WIDTH=250><A HREF="./KSPSetMonitor.html">KSPSetMonitor</A></TD>
<TR>
<TD WIDTH=250><A HREF="./KSPCGType.html">KSPCGType</A></TD>
<TD WIDTH=250><A HREF="./KSPSetInitialGuessNonzero.html">KSPSetInitialGuessNonzero</A></TD>
<TD WIDTH=250><A HREF="./KSPType.html">KSPType</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="./KSPCGSetType.html">KSPCGSetType</A></TD>
<TD WIDTH=250><A HREF="./KSPGMRESSetRestart.html">KSPGMRESSetRestart</A></TD>
<TD WIDTH=250><A HREF="./KSPLGTrueMonitorCreate.html">KSPLGTrueMonitorCreate</A></TD>
<TR>
<TD WIDTH=250><A HREF="./KSPChebychevSetEigenvalues.html">KSPChebychevSetEigenvalues</A></TD>
<TD WIDTH=250><A HREF="./KSPGetConvergedReason.html">KSPGetConvergedReason</A></TD>
<TD WIDTH=250><A HREF="./KSPLGTrueMonitorDestroy.html">KSPLGTrueMonitorDestroy</A></TD>
<TR>
<TD WIDTH=250><A HREF="./KSPClearMonitor.html">KSPClearMonitor</A></TD>
<TD WIDTH=250><A HREF="./KSPGetInitialGuessNonzero.html">KSPGetInitialGuessNonzero</A></TD>
<TD WIDTH=250><A HREF="./KSPRichardsonSetScale.html">KSPRichardsonSetScale</A></TD>
<TR>
<TD WIDTH=250><A HREF="./KSPDefaultConverged.html">KSPDefaultConverged</A></TD>
<TD WIDTH=250><A HREF="./KSPGetIterationNumber.html">KSPGetIterationNumber</A></TD>
<TD WIDTH=250><A HREF="./KSPSetPreconditionerSide.html">KSPSetPreconditionerSide</A></TD>
<TR>
<TD WIDTH=250><A HREF="./KSPDefaultMonitor.html">KSPDefaultMonitor</A></TD>
<TD WIDTH=250><A HREF="./KSPGetMonitorContext.html">KSPGetMonitorContext</A></TD>
<TD WIDTH=250><A HREF="./KSPSetTolerances.html">KSPSetTolerances</A></TD>
<TR>
<TD WIDTH=250><A HREF="./KSPFGMRESModifyPCNoChange.html">KSPFGMRESModifyPCNoChange</A></TD>
<TD WIDTH=250><A HREF="./KSPGetPreconditionerSide.html">KSPGetPreconditionerSide</A></TD>
<TD WIDTH=250><A HREF="./KSPSetType.html">KSPSetType</A></TD>
<TR>
<TD WIDTH=250><A HREF="./KSPFGMRESModifyPCSLES.html">KSPFGMRESModifyPCSLES</A></TD>
<TD WIDTH=250><A HREF="./KSPGetResidualNorm.html">KSPGetResidualNorm</A></TD>
<TD WIDTH=250><A HREF="./KSPSingularValueMonitor.html">KSPSingularValueMonitor</A></TD>
<TR>
<TD WIDTH=250><A HREF="./KSPFGMRESSetModifyPC.html">KSPFGMRESSetModifyPC</A></TD>
<TD WIDTH=250><A HREF="./KSPGetTolerances.html">KSPGetTolerances</A></TD>
<TD WIDTH=250><A HREF="./KSPTrueMonitor.html">KSPTrueMonitor</A></TD>
<TR>
<TD WIDTH=250><A HREF="./KSPGMRESKrylovMonitor.html">KSPGMRESKrylovMonitor</A></TD>
<TD WIDTH=250><A HREF="./KSPGetType.html">KSPGetType</A></TD>
<TD WIDTH=250><A HREF="./KSPVecViewMonitor.html">KSPVecViewMonitor</A></TD>
<TR>
<TD WIDTH=250><A HREF="./KSPGMRESSetOrthogonalization.html">KSPGMRESSetOrthogonalization</A></TD>
<TD WIDTH=250><A HREF="./KSPLGMonitorCreate.html">KSPLGMonitorCreate</A></TD>
<TD WIDTH=250><A HREF="./"></A></TD>
<TR>
<TD WIDTH=250><A HREF="./KSPGMRESSetPreAllocateVectors.html">KSPGMRESSetPreAllocateVectors</A></TD>
<TD WIDTH=250><A HREF="./KSPLGMonitorDestroy.html">KSPLGMonitorDestroy</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="./KSPAppendOptionsPrefix.html">KSPAppendOptionsPrefix</A></TD>
<TD WIDTH=250><A HREF="./KSPGetInitialGuessKnoll.html">KSPGetInitialGuessKnoll</A></TD>
<TD WIDTH=250><A HREF="./KSPSetConvergenceTest.html">KSPSetConvergenceTest</A></TD>
<TR>
<TD WIDTH=250><A HREF="./KSPBuildResidual.html">KSPBuildResidual</A></TD>
<TD WIDTH=250><A HREF="./KSPGetOptionsPrefix.html">KSPGetOptionsPrefix</A></TD>
<TD WIDTH=250><A HREF="./KSPSetInitialGuessKnoll.html">KSPSetInitialGuessKnoll</A></TD>
<TR>
<TD WIDTH=250><A HREF="./KSPBuildSolution.html">KSPBuildSolution</A></TD>
<TD WIDTH=250><A HREF="./KSPGetResidualHistory.html">KSPGetResidualHistory</A></TD>
<TD WIDTH=250><A HREF="./KSPSetNormType.html">KSPSetNormType</A></TD>
<TR>
<TD WIDTH=250><A HREF="./KSPComputeEigenvalues.html">KSPComputeEigenvalues</A></TD>
<TD WIDTH=250><A HREF="./KSPNormType.html">KSPNormType</A></TD>
<TD WIDTH=250><A HREF="./KSPSetOptionsPrefix.html">KSPSetOptionsPrefix</A></TD>
<TR>
<TD WIDTH=250><A HREF="./KSPComputeEigenvaluesExplicitly.html">KSPComputeEigenvaluesExplicitly</A></TD>
<TD WIDTH=250><A HREF="./KSPRegisterAll.html">KSPRegisterAll</A></TD>
<TD WIDTH=250><A HREF="./KSPSetResidualHistory.html">KSPSetResidualHistory</A></TD>
<TR>
<TD WIDTH=250><A HREF="./KSPComputeExplicitOperator.html">KSPComputeExplicitOperator</A></TD>
<TD WIDTH=250><A HREF="./KSPRegisterDestroy.html">KSPRegisterDestroy</A></TD>
<TD WIDTH=250><A HREF="./KSPSkipConverged.html">KSPSkipConverged</A></TD>
<TR>
<TD WIDTH=250><A HREF="./KSPComputeExtremeSingularValues.html">KSPComputeExtremeSingularValues</A></TD>
<TD WIDTH=250><A HREF="./KSPRegisterDynamic.html">KSPRegisterDynamic</A></TD>
<TD WIDTH=250><A HREF="./KSPUnwindPreconditioner.html">KSPUnwindPreconditioner</A></TD>
<TR>
<TD WIDTH=250><A HREF="./KSPGMRESSetHapTol.html">KSPGMRESSetHapTol</A></TD>
<TD WIDTH=250><A HREF="./KSPSetComputeEigenvalues.html">KSPSetComputeEigenvalues</A></TD>
<TD WIDTH=250><A HREF="./"></A></TD>
<TR>
<TD WIDTH=250><A HREF="./KSPGetConvergenceContext.html">KSPGetConvergenceContext</A></TD>
<TD WIDTH=250><A HREF="./KSPSetComputeSingularValues.html">KSPSetComputeSingularValues</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="./KSPAddOptionsChecker.html">KSPAddOptionsChecker</A></TD>
<TD WIDTH=250><A HREF="./KSPInitialResidual.html">KSPInitialResidual</A></TD>
<TD WIDTH=250><A HREF="./KSPSolve.html">KSPSolve</A></TD>
<TR>
<TD WIDTH=250><A HREF="./KSPCreate.html">KSPCreate</A></TD>
<TD WIDTH=250><A HREF="./KSPSetFromOptions.html">KSPSetFromOptions</A></TD>
<TD WIDTH=250><A HREF="./KSPSolveTranspose.html">KSPSolveTranspose</A></TD>
<TR>
<TD WIDTH=250><A HREF="./KSPDestroy.html">KSPDestroy</A></TD>
<TD WIDTH=250><A HREF="./KSPSetPC.html">KSPSetPC</A></TD>
<TD WIDTH=250><A HREF="./KSPView.html">KSPView</A></TD>
<TR>
<TD WIDTH=250><A HREF="./KSPGetPC.html">KSPGetPC</A></TD>
<TD WIDTH=250><A HREF="./KSPSetRhs.html">KSPSetRhs</A></TD>
<TD WIDTH=250><A HREF="./SLESInitializePackage.html">SLESInitializePackage</A></TD>
<TR>
<TD WIDTH=250><A HREF="./KSPGetRhs.html">KSPGetRhs</A></TD>
<TD WIDTH=250><A HREF="./KSPSetSolution.html">KSPSetSolution</A></TD>
<TD WIDTH=250><A HREF="./"></A></TD>
<TR>
<TD WIDTH=250><A HREF="./KSPGetSolution.html">KSPGetSolution</A></TD>
<TD WIDTH=250><A HREF="./KSPSetUp.html">KSPSetUp</A></TD>
<TD WIDTH=250><A HREF="./"></A></TD>
<TR>
</TABLE>
<BR><A HREF="../../index.html"><IMG SRC="../up.gif">Table of Contents</A>
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