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<div id="version" align=right><b>slepc-3.23.1 2025-05-01</b></div>
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<H1>NEPSetSplitPreconditioner</H1>
Sets an operator in split form from which to build the preconditioner to be used when solving the nonlinear eigenvalue problem in split form.
<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/NEPSetSplitPreconditioner.html#NEPSetSplitPreconditioner">NEPSetSplitPreconditioner</A>(<A HREF="../NEP/NEP.html#NEP">NEP</A> nep,<A HREF="https://petsc.org/release/manualpages/Sys/PetscInt.html#PetscInt">PetscInt</A> ntp,<A HREF="https://petsc.org/release/manualpages/Mat/Mat.html#Mat">Mat</A> P[],<A HREF="https://petsc.org/release/manualpages/Mat/MatStructure.html#MatStructure">MatStructure</A> strp)
</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>ntp </B></TD><TD> - number of terms in the split preconditioner
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>P </B></TD><TD> - array of matrices
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>strp </B></TD><TD> - structure flag for matrices
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#883300">Notes</FONT></H3>
The matrix for the preconditioner is expressed as P(lambda) =
sum_i P_i*f_i(lambda), for i=1,...,n, where the f_i functions
are the same as in <A HREF="../NEP/NEPSetSplitOperator.html#NEPSetSplitOperator">NEPSetSplitOperator</A>(). It is not necessary to call
this function. If it is not invoked, then the preconditioner is
built from T(lambda), i.e., both matrices and functions passed in
<A HREF="../NEP/NEPSetSplitOperator.html#NEPSetSplitOperator">NEPSetSplitOperator</A>().
<P>
The structure flag provides information about P_i's nonzero pattern
in the same way as in <A HREF="../NEP/NEPSetSplitOperator.html#NEPSetSplitOperator">NEPSetSplitOperator</A>().
<P>
If the functions defining the preconditioner operator were different
from the ones given in <A HREF="../NEP/NEPSetSplitOperator.html#NEPSetSplitOperator">NEPSetSplitOperator</A>(), then the split form
cannot be used. Use the callback interface instead.
<P>
Use ntp=0 to reset a previously set split preconditioner.
<P>
<P>
<H3><FONT COLOR="#883300">See Also</FONT></H3>
<A HREF="../NEP/NEPGetSplitPreconditionerTerm.html#NEPGetSplitPreconditionerTerm">NEPGetSplitPreconditionerTerm</A>(), <A HREF="../NEP/NEPGetSplitPreconditionerInfo.html#NEPGetSplitPreconditionerInfo">NEPGetSplitPreconditionerInfo</A>(), <A HREF="../NEP/NEPSetSplitOperator.html#NEPSetSplitOperator">NEPSetSplitOperator</A>()
<BR><P><B></B><H3><FONT COLOR="#883300">Level</FONT></H3>advanced<BR>
<H3><FONT COLOR="#883300">Location</FONT></H3>
</B><A HREF="../../../src/nep/interface/nepbasic.c.html#NEPSetSplitPreconditioner">src/nep/interface/nepbasic.c</A>
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