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<div id="version" align=right><b>slepc-3.23.1 2025-05-01</b></div>
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<H1>NEPComputeError</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 "slepcnep.h"
<A HREF="https://petsc.org/release/manualpages/Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../NEP/NEPComputeError.html#NEPComputeError">NEPComputeError</A>(<A HREF="../NEP/NEP.html#NEP">NEP</A> nep,<A HREF="https://petsc.org/release/manualpages/Sys/PetscInt.html#PetscInt">PetscInt</A> i,<A HREF="../NEP/NEPErrorType.html#NEPErrorType">NEPErrorType</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>nep </B></TD><TD> - the nonlinear 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 computed as ||T(lambda)x||_2 where lambda is the eigenvalue and x is the
eigenvector.
<P>
<P>
<H3><FONT COLOR="#883300">See Also</FONT></H3>
<A HREF="../NEP/NEPErrorType.html#NEPErrorType">NEPErrorType</A>, <A HREF="../NEP/NEPSolve.html#NEPSolve">NEPSolve</A>(), <A HREF="../NEP/NEPGetErrorEstimate.html#NEPGetErrorEstimate">NEPGetErrorEstimate</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/nep/interface/nepsolve.c.html#NEPComputeError">src/nep/interface/nepsolve.c</A>
<P><H3><FONT COLOR="#883300">Examples</FONT></H3>
<A HREF="../../../src/nep/tutorials/ex20.c.html">src/nep/tutorials/ex20.c</A><BR>
<A HREF="../../../src/nep/tutorials/ex20f.F90.html">src/nep/tutorials/ex20f.F90</A><BR>
<BR><BR><A HREF="./index.html">Index of all NEP routines</A>
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