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<H1>EPSComputeResidualNorm</H1>
Computes the norm of the residual vector associated with the i-th computed eigenpair.
<H3><FONT COLOR="#883300">Synopsis</FONT></H3>
<PRE>
#include "slepceps.h"
PetscErrorCode EPSComputeResidualNorm(EPS eps,PetscInt i,PetscReal *norm)
</PRE>
Collective on <A HREF="../EPS/EPS.html#EPS">EPS</A>
<P>
<H3><FONT COLOR="#883300">Input Parameter</FONT></H3>
<DT><B>eps </B> - the eigensolver context
<br>
<DT><B>i </B> - the solution index
<br>
<P>
<H3><FONT COLOR="#883300">Output Parameter</FONT></H3>
<DT><B>norm </B> - the residual norm, computed as ||Ax-kBx||_2 where k is the
eigenvalue and x is the eigenvector.
If k=0 then the residual norm is computed as ||Ax||_2.
<br>
<P>
<H3><FONT COLOR="#883300">Notes</FONT></H3>
The index i should be a value between 0 and nconv-1 (see <A HREF="../EPS/EPSGetConverged.html#EPSGetConverged">EPSGetConverged</A>()).
Eigenpairs are indexed according to the ordering criterion established
with <A HREF="../EPS/EPSSetWhichEigenpairs.html#EPSSetWhichEigenpairs">EPSSetWhichEigenpairs</A>().
<P>
<P>
<H3><FONT COLOR="#883300">See Also</FONT></H3>
<A HREF="../EPS/EPSSolve.html#EPSSolve">EPSSolve</A>(), <A HREF="../EPS/EPSGetConverged.html#EPSGetConverged">EPSGetConverged</A>(), <A HREF="../EPS/EPSSetWhichEigenpairs.html#EPSSetWhichEigenpairs">EPSSetWhichEigenpairs</A>()
<BR><P><B><FONT COLOR="#883300">Location: </FONT></B><A HREF="../../../src/eps/interface/solve.c.html#EPSComputeResidualNorm">src/eps/interface/solve.c</A>
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