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<div id="version" align=right><b>slepc-3.23.1 2025-05-01</b></div>
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<H1>EPSComputeError</H1>
Computes the error (based on the residual norm) associated with the i-th computed eigenpair.
<H3><FONT COLOR="#883300">Synopsis</FONT></H3>
<PRE>
#include "slepceps.h"
<A HREF="https://petsc.org/release/manualpages/Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../EPS/EPSComputeError.html#EPSComputeError">EPSComputeError</A>(<A HREF="../EPS/EPS.html#EPS">EPS</A> eps,<A HREF="https://petsc.org/release/manualpages/Sys/PetscInt.html#PetscInt">PetscInt</A> i,<A HREF="../EPS/EPSErrorType.html#EPSErrorType">EPSErrorType</A> type,<A HREF="https://petsc.org/release/manualpages/Sys/PetscReal.html#PetscReal">PetscReal</A> *error)
</PRE>
Collective
<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> - the eigensolver context
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>i </B></TD><TD> - the solution index
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>type </B></TD><TD> - the type of error to compute
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#883300">Output Parameter</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>error </B></TD><TD> - the error
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#883300">Notes</FONT></H3>
The error can be computed in various ways, all of them based on the residual
norm ||Ax-kBx||_2 where k is the eigenvalue and x is the eigenvector.
<P>
<P>
<H3><FONT COLOR="#883300">See Also</FONT></H3>
<A HREF="../EPS/EPSErrorType.html#EPSErrorType">EPSErrorType</A>, <A HREF="../EPS/EPSSolve.html#EPSSolve">EPSSolve</A>(), <A HREF="../EPS/EPSGetErrorEstimate.html#EPSGetErrorEstimate">EPSGetErrorEstimate</A>()
<BR><P><B></B><H3><FONT COLOR="#883300">Level</FONT></H3>beginner<BR>
<H3><FONT COLOR="#883300">Location</FONT></H3>
</B><A HREF="../../../src/eps/interface/epssolve.c.html#EPSComputeError">src/eps/interface/epssolve.c</A>
<P><H3><FONT COLOR="#883300">Examples</FONT></H3>
<A HREF="../../../src/eps/tutorials/ex1.c.html">src/eps/tutorials/ex1.c</A><BR>
<A HREF="../../../src/eps/tutorials/ex19.c.html">src/eps/tutorials/ex19.c</A><BR>
<A HREF="../../../src/eps/tutorials/ex31.c.html">src/eps/tutorials/ex31.c</A><BR>
<BR><BR><A HREF="./index.html">Index of all EPS routines</A>
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