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<H1>EPSMonitorSet</H1>
Sets an ADDITIONAL function to be called at every iteration to monitor the error estimates for each requested eigenpair.
<H3><FONT COLOR="#883300">Synopsis</FONT></H3>
<PRE>
#include "slepceps.h"
PetscErrorCode EPSMonitorSet(EPS eps,PetscErrorCode (*monitor)(EPS,PetscInt,PetscInt,PetscScalar*,PetscScalar*,PetscReal*,PetscInt,void*),void *mctx,PetscErrorCode (*monitordestroy)(void**))
</PRE>
Logically Collective on <A HREF="../EPS/EPS.html#EPS">EPS</A>
<P>
<H3><FONT COLOR="#883300">Input Parameters</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>eps </B></TD><TD> - eigensolver context obtained from <A HREF="../EPS/EPSCreate.html#EPSCreate">EPSCreate</A>()
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>monitor </B></TD><TD> - pointer to function (if this is PETSC_NULL, it turns off monitoring)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>mctx </B></TD><TD> - [optional] context for private data for the
monitor routine (use PETSC_NULL if no context is desired)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>monitordestroy </B></TD><TD> - [optional] routine that frees monitor context
(may be PETSC_NULL)
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#883300">Calling Sequence of monitor</FONT></H3>
<pre>
monitor (<A HREF="../EPS/EPS.html#EPS">EPS</A> eps, int its, int nconv, PetscScalar *eigr, PetscScalar *eigi, PetscReal* errest, int nest, void *mctx)
</pre>
<P>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>eps </B></TD><TD> - eigensolver context obtained from <A HREF="../EPS/EPSCreate.html#EPSCreate">EPSCreate</A>()
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>its </B></TD><TD> - iteration number
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>nconv </B></TD><TD> - number of converged eigenpairs
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>eigr </B></TD><TD> - real part of the eigenvalues
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>eigi </B></TD><TD> - imaginary part of the eigenvalues
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>errest </B></TD><TD> - relative error estimates for each eigenpair
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>nest </B></TD><TD> - number of error estimates
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>mctx </B></TD><TD> - optional monitoring context, as set by <A HREF="../EPS/EPSMonitorSet.html#EPSMonitorSet">EPSMonitorSet</A>()
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#883300">Options Database Keys</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-eps_monitor </B></TD><TD> - print only the first error estimate
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-eps_monitor_all </B></TD><TD> - print error estimates at each iteration
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-eps_monitor_conv </B></TD><TD> - print the eigenvalue approximations only when
convergence has been reached
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-eps_monitor_draw </B></TD><TD> - sets line graph monitor for the first unconverged
approximate eigenvalue
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-eps_monitor_draw_all </B></TD><TD> - sets line graph monitor for all unconverged
approximate eigenvalue
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-eps_monitor_cancel </B></TD><TD> - cancels all monitors that have been hardwired into
a code by calls to <A HREF="../EPS/EPSMonitorSet.html#EPSMonitorSet">EPSMonitorSet</A>(), but does not cancel those set via
the options database.
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#883300">Notes</FONT></H3>
Several different monitoring routines may be set by calling
<A HREF="../EPS/EPSMonitorSet.html#EPSMonitorSet">EPSMonitorSet</A>() multiple times; all will be called in the
order in which they were set.
<P>
<P>
<H3><FONT COLOR="#883300">See Also</FONT></H3>
<A HREF="../EPS/EPSMonitorFirst.html#EPSMonitorFirst">EPSMonitorFirst</A>(), <A HREF="../EPS/EPSMonitorAll.html#EPSMonitorAll">EPSMonitorAll</A>(), <A HREF="../EPS/EPSMonitorCancel.html#EPSMonitorCancel">EPSMonitorCancel</A>()
<BR><P><B><FONT COLOR="#883300">Location: </FONT></B><A HREF="../../../src/eps/interface/monitor.c.html#EPSMonitorSet">src/eps/interface/monitor.c</A>
<BR><A HREF="./index.html">Index of all EPS routines</A>
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