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<TITLE>KSPSetComputeSingularValues</TITLE>
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<div id="version" align=right><b>petsc-3.10.3 2018-12-18</b></div>
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<A NAME="KSPSetComputeSingularValues"><H1>KSPSetComputeSingularValues</H1></A>
Sets a flag so that the extreme singular values will be calculated via a Lanczos or Arnoldi process as the linear system is solved.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscksp.h"
<A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../KSP/KSPSetComputeSingularValues.html#KSPSetComputeSingularValues">KSPSetComputeSingularValues</A>(<A HREF="../KSP/KSP.html#KSP">KSP</A> ksp,<A HREF="../Sys/PetscBool.html#PetscBool">PetscBool</A> flg)
</PRE>
Logically Collective on <A HREF="../KSP/KSP.html#KSP">KSP</A>
<P>
<H3><FONT COLOR="#CC3333">Input Parameters</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ksp </B></TD><TD>- iterative context obtained from <A HREF="../KSP/KSPCreate.html#KSPCreate">KSPCreate</A>()
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>flg </B></TD><TD>- <A HREF="../Sys/PETSC_TRUE.html#PETSC_TRUE">PETSC_TRUE</A> or <A HREF="../Sys/PETSC_FALSE.html#PETSC_FALSE">PETSC_FALSE</A>
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Options Database Key</FONT></H3>
<DT><B>-ksp_monitor_singular_value </B> -Activates <A HREF="../KSP/KSPSetComputeSingularValues.html#KSPSetComputeSingularValues">KSPSetComputeSingularValues</A>()
<br>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
Currently this option is not valid for all iterative methods.
<P>
Many users may just want to use the monitoring routine
<A HREF="../KSP/KSPMonitorSingularValue.html#KSPMonitorSingularValue">KSPMonitorSingularValue</A>() (which can be set with option -ksp_monitor_singular_value)
to print the singular values at each iteration of the linear solve.
<P>
<P>
<H3><FONT COLOR="#CC3333">Keywords</FONT></H3>
set, compute, singular values
<BR>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../KSP/KSPComputeExtremeSingularValues.html#KSPComputeExtremeSingularValues">KSPComputeExtremeSingularValues</A>(), <A HREF="../KSP/KSPMonitorSingularValue.html#KSPMonitorSingularValue">KSPMonitorSingularValue</A>(), <A HREF="../KSP/KSP.html#KSP">KSP</A>
<BR><P><B></B><H3><FONT COLOR="#CC3333">Level</FONT></H3>advanced<BR>
<H3><FONT COLOR="#CC3333">Location</FONT></H3>
</B><A HREF="../../../src/ksp/ksp/interface/itfunc.c.html#KSPSetComputeSingularValues">src/ksp/ksp/interface/itfunc.c</A>
<P><H3><FONT COLOR="#CC3333">Examples</FONT></H3>
<A HREF="../../../src/ksp/ksp/examples/tutorials/ex56.c.html">src/ksp/ksp/examples/tutorials/ex56.c.html</A><BR>
<A HREF="../../../src/snes/examples/tutorials/ex30.c.html">src/snes/examples/tutorials/ex30.c.html</A><BR>
<A HREF="../../../src/snes/examples/tutorials/ex56.c.html">src/snes/examples/tutorials/ex56.c.html</A><BR>
<BR><A HREF="./index.html">Index of all KSP routines</A>
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