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<A NAME="KSPGetTolerances"><H1>KSPGetTolerances</H1></A>
Gets the relative, absolute, divergence, and maximum iteration tolerances used by the default <A HREF="../KSP/KSP.html#KSP">KSP</A> convergence tests.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscksp.h"
PetscErrorCode PETSCKSP_DLLEXPORT KSPGetTolerances(KSP ksp,PetscReal *rtol,PetscReal *abstol,PetscReal *dtol,PetscInt *maxits)
</PRE>
Not Collective
<P>
<H3><FONT COLOR="#CC3333">Input Parameter</FONT></H3>
<DT><B>ksp </B> -the Krylov subspace context
<br>
<H3><FONT COLOR="#CC3333">Output Parameters</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>rtol </B></TD><TD>- the relative convergence tolerance
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>abstol </B></TD><TD>- the absolute convergence tolerance
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>dtol </B></TD><TD>- the divergence tolerance
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>maxits </B></TD><TD>- maximum number of iterations
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
The user can specify <A HREF="../Sys/PETSC_NULL.html#PETSC_NULL">PETSC_NULL</A> for any parameter that is not needed.
<P>
<P>
<H3><FONT COLOR="#CC3333">Keywords</FONT></H3>
<A HREF="../KSP/KSP.html#KSP">KSP</A>, get, tolerance, absolute, relative, divergence, convergence,
<BR>maximum, iterations
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../KSP/KSPSetTolerances.html#KSPSetTolerances">KSPSetTolerances</A>()
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>intermediate
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/ksp/ksp/interface/itfunc.c.html#KSPGetTolerances">src/ksp/ksp/interface/itfunc.c</A>
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