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<div id="version" align=right><b>slepc-3.23.1 2025-05-01</b></div>
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<H1>SlepcArbitrarySelectionFn</H1>
A prototype of an arbitrary selection function that would be passed to <A HREF="../EPS/EPSSetArbitrarySelection.html#EPSSetArbitrarySelection">EPSSetArbitrarySelection</A>() and analogue functions in other solver types
<H3><FONT COLOR="#883300">Synopsis</FONT></H3>
<PRE>
PETSC_EXTERN_TYPEDEF typedef <A HREF="https://petsc.org/release/manualpages/Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A>(<A HREF="../sys/SlepcArbitrarySelectionFn.html#SlepcArbitrarySelectionFn">SlepcArbitrarySelectionFn</A>)(<A HREF="https://petsc.org/release/manualpages/Sys/PetscScalar.html#PetscScalar">PetscScalar</A> er,<A HREF="https://petsc.org/release/manualpages/Sys/PetscScalar.html#PetscScalar">PetscScalar</A> ei,<A HREF="https://petsc.org/release/manualpages/Vec/Vec.html#Vec">Vec</A> xr,<A HREF="https://petsc.org/release/manualpages/Vec/Vec.html#Vec">Vec</A> xi,<A HREF="https://petsc.org/release/manualpages/Sys/PetscScalar.html#PetscScalar">PetscScalar</A> *rr,<A HREF="https://petsc.org/release/manualpages/Sys/PetscScalar.html#PetscScalar">PetscScalar</A> *ri,void *ctx);
</PRE>
<H3><FONT COLOR="#883300">Calling Sequence</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>er </B></TD><TD> - real part of the current eigenvalue approximation
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ei </B></TD><TD> - imaginary part of the current eigenvalue approximation
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>xr </B></TD><TD> - real part of the current eigenvector approximation
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>xi </B></TD><TD> - imaginary part of the current eigenvector approximation
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>rr </B></TD><TD> - result of evaluation (real part)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ri </B></TD><TD> - result of evaluation (imaginary part)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ctx </B></TD><TD> - [optional] user-defined context for private data for the
arbitrary selection routine (may be NULL)
</TD></TR></TABLE>
<P>
<P>
<H3><FONT COLOR="#883300">See Also</FONT></H3>
<A HREF="../EPS/EPSSetArbitrarySelection.html#EPSSetArbitrarySelection">EPSSetArbitrarySelection</A>()
<BR><P><B></B><H3><FONT COLOR="#883300">Level</FONT></H3>advanced<BR>
<H3><FONT COLOR="#883300">Location</FONT></H3>
</B><A HREF="../../../include/slepcsc.h.html#SlepcArbitrarySelectionFn">include/slepcsc.h</A>
<BR><BR><A HREF="./index.html">Index of all sys routines</A>
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