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<HTML>
<HEAD>
<TITLE>Nonlinear solvers - SNES</TITLE>
</HEAD>
<BODY BGCOLOR="FFFFFF">
<H2> Nonlinear solvers - SNES: <A HREF="../../../src/snes/examples/tutorials/index.html">Examples</A></H2>
The Scalable Nonlinear Equations Solvers (SNES) component provides an
easy-to-use interface to Newton-based methods for solving systems of
nonlinear equations. SNES users can set various algorithmic options
at runtime via the options database (e.g., specifying a trust region
method via
<font face ="Courier">
-snes_type tr
</font face>
).
SNES internally employs <A HREF="../../../docs/manualpages/KSP/index.html">KSP</A> for the solution of
its linear systems.
SNES users can also set KSP options directly in application
codes by first extracting the KSP context from the SNES context via
<A HREF="../../../docs/manualpages/SNES/SNESGetKSP.html">SNESGetKSP()</A>
and then directly calling various KSP (and KSP and PC) routines (e.g.,
<A HREF="../../../docs/manualpages/PC/PCSetType.html">PCSetType()</A>
).
<P>
<P>
<TABLE>
<TR><TD WIDTH=250 COLSPAN="3"><B>Beginner - Basic usage</B></TD></TR>
<TD WIDTH=250><A HREF="./SNES.html">SNES</A></TD>
<TD WIDTH=250><A HREF="./SNESSORQN.html">SNESSORQN</A></TD>
<TD WIDTH=250><A HREF="./SNES_CONVERGED_FNORM_ABS.html">SNES_CONVERGED_FNORM_ABS</A></TD>
<TR>
<TD WIDTH=250><A HREF="./SNESConvergedReason.html">SNESConvergedReason</A></TD>
<TD WIDTH=250><A HREF="./SNESSetFromOptions.html">SNESSetFromOptions</A></TD>
<TD WIDTH=250><A HREF="./SNES_CONVERGED_FNORM_RELATIVE.html">SNES_CONVERGED_FNORM_RELATIVE</A></TD>
<TR>
<TD WIDTH=250><A HREF="./SNESCreate.html">SNESCreate</A></TD>
<TD WIDTH=250><A HREF="./SNESSetFunction.html">SNESSetFunction</A></TD>
<TD WIDTH=250><A HREF="./SNES_CONVERGED_PNORM_RELATIVE.html">SNES_CONVERGED_PNORM_RELATIVE</A></TD>
<TR>
<TD WIDTH=250><A HREF="./SNESDestroy.html">SNESDestroy</A></TD>
<TD WIDTH=250><A HREF="./SNESSetJacobian.html">SNESSetJacobian</A></TD>
<TD WIDTH=250><A HREF="./SNES_DIVERGED_FNORM_NAN.html">SNES_DIVERGED_FNORM_NAN</A></TD>
<TR>
<TD WIDTH=250><A HREF="./SNESGetKSP.html">SNESGetKSP</A></TD>
<TD WIDTH=250><A HREF="./SNESSolve.html">SNESSolve</A></TD>
<TD WIDTH=250><A HREF="./SNES_DIVERGED_FUNCTION_COUNT.html">SNES_DIVERGED_FUNCTION_COUNT</A></TD>
<TR>
<TD WIDTH=250><A HREF="./SNESKSPONLY.html">SNESKSPONLY</A></TD>
<TD WIDTH=250><A HREF="./SNESType.html">SNESType</A></TD>
<TD WIDTH=250><A HREF="./SNES_DIVERGED_LINE_SEARCH.html">SNES_DIVERGED_LINE_SEARCH</A></TD>
<TR>
<TD WIDTH=250><A HREF="./SNESLS.html">SNESLS</A></TD>
<TD WIDTH=250><A HREF="./SNESVI.html">SNESVI</A></TD>
<TD WIDTH=250><A HREF="./SNES_DIVERGED_LOCAL_MIN.html">SNES_DIVERGED_LOCAL_MIN</A></TD>
<TR>
<TD WIDTH=250><A HREF="./SNESNGMRES.html">SNESNGMRES</A></TD>
<TD WIDTH=250><A HREF="./SNESView.html">SNESView</A></TD>
<TD WIDTH=250><A HREF="./SNES_DIVERGED_MAX_IT.html">SNES_DIVERGED_MAX_IT</A></TD>
<TR>
<TD WIDTH=250><A HREF="./SNESPICARD.html">SNESPICARD</A></TD>
<TD WIDTH=250><A HREF="./SNES_CONERGED_ITERATING.html">SNES_CONERGED_ITERATING</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="./SNESDAComputeJacobianWithAdic.html">SNESDAComputeJacobianWithAdic</A></TD>
<TD WIDTH=250><A HREF="./SNESGetNonlinearStepFailures.html">SNESGetNonlinearStepFailures</A></TD>
<TD WIDTH=250><A HREF="./SNESPythonSetType.html">SNESPythonSetType</A></TD>
<TR>
<TD WIDTH=250><A HREF="./SNESDefaultComputeJacobian.html">SNESDefaultComputeJacobian</A></TD>
<TD WIDTH=250><A HREF="./SNESGetNumberFunctionEvals.html">SNESGetNumberFunctionEvals</A></TD>
<TD WIDTH=250><A HREF="./SNESReset.html">SNESReset</A></TD>
<TR>
<TD WIDTH=250><A HREF="./SNESDefaultComputeJacobianColor.html">SNESDefaultComputeJacobianColor</A></TD>
<TD WIDTH=250><A HREF="./SNESGetRhs.html">SNESGetRhs</A></TD>
<TD WIDTH=250><A HREF="./SNESSetApplicationContext.html">SNESSetApplicationContext</A></TD>
<TR>
<TD WIDTH=250><A HREF="./SNESDefaultConverged.html">SNESDefaultConverged</A></TD>
<TD WIDTH=250><A HREF="./SNESGetSolution.html">SNESGetSolution</A></TD>
<TD WIDTH=250><A HREF="./SNESSetComputeApplicationContext.html">SNESSetComputeApplicationContext</A></TD>
<TR>
<TD WIDTH=250><A HREF="./SNESDefaultUpdate.html">SNESDefaultUpdate</A></TD>
<TD WIDTH=250><A HREF="./SNESGetTolerances.html">SNESGetTolerances</A></TD>
<TD WIDTH=250><A HREF="./SNESSetComputeInitialGuess.html">SNESSetComputeInitialGuess</A></TD>
<TR>
<TD WIDTH=250><A HREF="./SNESGetApplicationContext.html">SNESGetApplicationContext</A></TD>
<TD WIDTH=250><A HREF="./SNESGetType.html">SNESGetType</A></TD>
<TD WIDTH=250><A HREF="./SNESSetConvergenceHistory.html">SNESSetConvergenceHistory</A></TD>
<TR>
<TD WIDTH=250><A HREF="./SNESGetConvergedReason.html">SNESGetConvergedReason</A></TD>
<TD WIDTH=250><A HREF="./SNESLineSearchGetParams.html">SNESLineSearchGetParams</A></TD>
<TD WIDTH=250><A HREF="./SNESSetDM.html">SNESSetDM</A></TD>
<TR>
<TD WIDTH=250><A HREF="./SNESGetConvergenceHistory.html">SNESGetConvergenceHistory</A></TD>
<TD WIDTH=250><A HREF="./SNESLineSearchSetMonitor.html">SNESLineSearchSetMonitor</A></TD>
<TD WIDTH=250><A HREF="./SNESSetErrorIfNotConverged.html">SNESSetErrorIfNotConverged</A></TD>
<TR>
<TD WIDTH=250><A HREF="./SNESGetDM.html">SNESGetDM</A></TD>
<TD WIDTH=250><A HREF="./SNESLineSearchSetParams.html">SNESLineSearchSetParams</A></TD>
<TD WIDTH=250><A HREF="./SNESSetGridSequence.html">SNESSetGridSequence</A></TD>
<TR>
<TD WIDTH=250><A HREF="./SNESGetErrorIfNotConverged.html">SNESGetErrorIfNotConverged</A></TD>
<TD WIDTH=250><A HREF="./SNESMonitorCancel.html">SNESMonitorCancel</A></TD>
<TD WIDTH=250><A HREF="./SNESSetLagJacobian.html">SNESSetLagJacobian</A></TD>
<TR>
<TD WIDTH=250><A HREF="./SNESGetFunctionNorm.html">SNESGetFunctionNorm</A></TD>
<TD WIDTH=250><A HREF="./SNESMonitorDefault.html">SNESMonitorDefault</A></TD>
<TD WIDTH=250><A HREF="./SNESSetLagPreconditioner.html">SNESSetLagPreconditioner</A></TD>
<TR>
<TD WIDTH=250><A HREF="./SNESGetIterationNumber.html">SNESGetIterationNumber</A></TD>
<TD WIDTH=250><A HREF="./SNESMonitorRange.html">SNESMonitorRange</A></TD>
<TD WIDTH=250><A HREF="./SNESSetMaxLinearSolveFailures.html">SNESSetMaxLinearSolveFailures</A></TD>
<TR>
<TD WIDTH=250><A HREF="./SNESGetLagJacobian.html">SNESGetLagJacobian</A></TD>
<TD WIDTH=250><A HREF="./SNESMonitorRatio.html">SNESMonitorRatio</A></TD>
<TD WIDTH=250><A HREF="./SNESSetMaxNonlinearStepFailures.html">SNESSetMaxNonlinearStepFailures</A></TD>
<TR>
<TD WIDTH=250><A HREF="./SNESGetLagPreconditioner.html">SNESGetLagPreconditioner</A></TD>
<TD WIDTH=250><A HREF="./SNESMonitorResidual.html">SNESMonitorResidual</A></TD>
<TD WIDTH=250><A HREF="./SNESSetTolerances.html">SNESSetTolerances</A></TD>
<TR>
<TD WIDTH=250><A HREF="./SNESGetLinearSolveFailures.html">SNESGetLinearSolveFailures</A></TD>
<TD WIDTH=250><A HREF="./SNESMonitorSet.html">SNESMonitorSet</A></TD>
<TD WIDTH=250><A HREF="./SNESSetTrustRegionTolerance.html">SNESSetTrustRegionTolerance</A></TD>
<TR>
<TD WIDTH=250><A HREF="./SNESGetLinearSolveIterations.html">SNESGetLinearSolveIterations</A></TD>
<TD WIDTH=250><A HREF="./SNESMonitorSetRatio.html">SNESMonitorSetRatio</A></TD>
<TD WIDTH=250><A HREF="./SNESSetType.html">SNESSetType</A></TD>
<TR>
<TD WIDTH=250><A HREF="./SNESGetMaxLinearSolveFailures.html">SNESGetMaxLinearSolveFailures</A></TD>
<TD WIDTH=250><A HREF="./SNESMonitorSolution.html">SNESMonitorSolution</A></TD>
<TD WIDTH=250><A HREF="./SNESTEST.html">SNESTEST</A></TD>
<TR>
<TD WIDTH=250><A HREF="./SNESGetMaxNonlinearStepFailures.html">SNESGetMaxNonlinearStepFailures</A></TD>
<TD WIDTH=250><A HREF="./SNESMonitorSolutionUpdate.html">SNESMonitorSolutionUpdate</A></TD>
<TD WIDTH=250><A HREF="./SNESTR.html">SNESTR</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="./MatCreateSNESMF.html">MatCreateSNESMF</A></TD>
<TD WIDTH=250><A HREF="./SNESLineSearchCubic.html">SNESLineSearchCubic</A></TD>
<TD WIDTH=250><A HREF="./SNESRegisterDynamic.html">SNESRegisterDynamic</A></TD>
<TR>
<TD WIDTH=250><A HREF="./SNESAppendOptionsPrefix.html">SNESAppendOptionsPrefix</A></TD>
<TD WIDTH=250><A HREF="./SNESLineSearchNo.html">SNESLineSearchNo</A></TD>
<TD WIDTH=250><A HREF="./SNESSetConvergenceTest.html">SNESSetConvergenceTest</A></TD>
<TR>
<TD WIDTH=250><A HREF="./SNESDefaultMatrixFreeSetParameters2.html">SNESDefaultMatrixFreeSetParameters2</A></TD>
<TD WIDTH=250><A HREF="./SNESLineSearchNoNorms.html">SNESLineSearchNoNorms</A></TD>
<TD WIDTH=250><A HREF="./SNESSetFunctionDomainError.html">SNESSetFunctionDomainError</A></TD>
<TR>
<TD WIDTH=250><A HREF="./SNESGetFunction.html">SNESGetFunction</A></TD>
<TD WIDTH=250><A HREF="./SNESLineSearchQuadratic.html">SNESLineSearchQuadratic</A></TD>
<TD WIDTH=250><A HREF="./SNESSetOptionsPrefix.html">SNESSetOptionsPrefix</A></TD>
<TR>
<TD WIDTH=250><A HREF="./SNESGetJacobian.html">SNESGetJacobian</A></TD>
<TD WIDTH=250><A HREF="./SNESLineSearchSet.html">SNESLineSearchSet</A></TD>
<TD WIDTH=250><A HREF="./SNESSetUp.html">SNESSetUp</A></TD>
<TR>
<TD WIDTH=250><A HREF="./SNESGetOptionsPrefix.html">SNESGetOptionsPrefix</A></TD>
<TD WIDTH=250><A HREF="./SNESLineSearchSetPostCheck.html">SNESLineSearchSetPostCheck</A></TD>
<TD WIDTH=250><A HREF="./SNESSetUpdate.html">SNESSetUpdate</A></TD>
<TR>
<TD WIDTH=250><A HREF="./SNESGetSolutionUpdate.html">SNESGetSolutionUpdate</A></TD>
<TD WIDTH=250><A HREF="./SNESLineSearchSetPreCheck.html">SNESLineSearchSetPreCheck</A></TD>
<TD WIDTH=250><A HREF="./SNESSkipConverged.html">SNESSkipConverged</A></TD>
<TR>
<TD WIDTH=250><A HREF="./SNESKSPGetParametersEW.html">SNESKSPGetParametersEW</A></TD>
<TD WIDTH=250><A HREF="./SNESMatrixFreeCreate2.html">SNESMatrixFreeCreate2</A></TD>
<TD WIDTH=250><A HREF="./SNESVISetComputeVariableBounds.html">SNESVISetComputeVariableBounds</A></TD>
<TR>
<TD WIDTH=250><A HREF="./SNESKSPGetUseEW.html">SNESKSPGetUseEW</A></TD>
<TD WIDTH=250><A HREF="./SNESRegister.html">SNESRegister</A></TD>
<TD WIDTH=250><A HREF="./SNESVISetVariableBounds.html">SNESVISetVariableBounds</A></TD>
<TR>
<TD WIDTH=250><A HREF="./SNESKSPSetParametersEW.html">SNESKSPSetParametersEW</A></TD>
<TD WIDTH=250><A HREF="./SNESRegisterAll.html">SNESRegisterAll</A></TD>
<TD WIDTH=250><A HREF="./"></A></TD>
<TR>
<TD WIDTH=250><A HREF="./SNESKSPSetUseEW.html">SNESKSPSetUseEW</A></TD>
<TD WIDTH=250><A HREF="./SNESRegisterDestroy.html">SNESRegisterDestroy</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="./MatMFFDComputeJacobian.html">MatMFFDComputeJacobian</A></TD>
<TD WIDTH=250><A HREF="./SNESDefaultGetWork.html">SNESDefaultGetWork</A></TD>
<TD WIDTH=250><A HREF="./SNESMonitor.html">SNESMonitor</A></TD>
<TR>
<TD WIDTH=250><A HREF="./SNESAddOptionsChecker.html">SNESAddOptionsChecker</A></TD>
<TD WIDTH=250><A HREF="./SNESFinalizePackage.html">SNESFinalizePackage</A></TD>
<TD WIDTH=250><A HREF="./SNESSetKSP.html">SNESSetKSP</A></TD>
<TR>
<TD WIDTH=250><A HREF="./SNESComputeFunction.html">SNESComputeFunction</A></TD>
<TD WIDTH=250><A HREF="./SNESGetPC.html">SNESGetPC</A></TD>
<TD WIDTH=250><A HREF="./SNESSetPC.html">SNESSetPC</A></TD>
<TR>
<TD WIDTH=250><A HREF="./SNESComputeJacobian.html">SNESComputeJacobian</A></TD>
<TD WIDTH=250><A HREF="./SNESInitializePackage.html">SNESInitializePackage</A></TD>
<TD WIDTH=250><A HREF="./"></A></TD>
<TR>
<TR><TD WIDTH=250 COLSPAN="3"><B>No deprecated routines</B></TD></TR>
</TABLE>
<BR><A HREF="../../index.html">Table of Contents</A>
|
