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<div id="version" align=right><b>slepc-3.23.1 2025-05-01</b></div>
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<H1>NEPSetSplitOperator</H1>
Sets the operator of 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/NEPSetSplitOperator.html#NEPSetSplitOperator">NEPSetSplitOperator</A>(<A HREF="../NEP/NEP.html#NEP">NEP</A> nep,<A HREF="https://petsc.org/release/manualpages/Sys/PetscInt.html#PetscInt">PetscInt</A> nt,<A HREF="https://petsc.org/release/manualpages/Mat/Mat.html#Mat">Mat</A> A[],<A HREF="../FN/FN.html#FN">FN</A> f[],<A HREF="https://petsc.org/release/manualpages/Mat/MatStructure.html#MatStructure">MatStructure</A> str)
</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>nt </B></TD><TD> - number of terms in the split form
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>A </B></TD><TD> - array of matrices
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>f </B></TD><TD> - array of functions
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>str </B></TD><TD> - structure flag for matrices
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#883300">Notes</FONT></H3>
The nonlinear operator is written as T(lambda) = sum_i A_i*f_i(lambda),
for i=1,...,n. The derivative T'(lambda) can be obtained using the
derivatives of f_i.
<P>
The structure flag provides information about A_i's nonzero pattern
(see <A HREF="https://petsc.org/release/manualpages/Mat/MatStructure.html#MatStructure">MatStructure</A> enum). If all matrices have the same pattern, then
use <A HREF="https://petsc.org/release/manualpages/Mat/MatStructure.html#MatStructure">SAME_NONZERO_PATTERN</A>. If the patterns are different but contained
in the pattern of the first one, then use <A HREF="https://petsc.org/release/manualpages/Mat/MatStructure.html#MatStructure">SUBSET_NONZERO_PATTERN</A>. If
patterns are known to be different, use <A HREF="https://petsc.org/release/manualpages/Mat/MatStructure.html#MatStructure">DIFFERENT_NONZERO_PATTERN</A>.
If set to <A HREF="https://petsc.org/release/manualpages/Mat/MatStructure.html#MatStructure">UNKNOWN_NONZERO_PATTERN</A>, the patterns will be compared to
determine if they are equal.
<P>
This function must be called before <A HREF="../NEP/NEPSetUp.html#NEPSetUp">NEPSetUp</A>(). If it is called again
after <A HREF="../NEP/NEPSetUp.html#NEPSetUp">NEPSetUp</A>() then the <A HREF="../NEP/NEP.html#NEP">NEP</A> object is reset.
<P>
<P>
<H3><FONT COLOR="#883300">See Also</FONT></H3>
<A HREF="../NEP/NEPGetSplitOperatorTerm.html#NEPGetSplitOperatorTerm">NEPGetSplitOperatorTerm</A>(), <A HREF="../NEP/NEPGetSplitOperatorInfo.html#NEPGetSplitOperatorInfo">NEPGetSplitOperatorInfo</A>(), <A HREF="../NEP/NEPSetSplitPreconditioner.html#NEPSetSplitPreconditioner">NEPSetSplitPreconditioner</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/nepbasic.c.html#NEPSetSplitOperator">src/nep/interface/nepbasic.c</A>
<P><H3><FONT COLOR="#883300">Examples</FONT></H3>
<A HREF="../../../src/nep/tutorials/ex22.c.html">src/nep/tutorials/ex22.c</A><BR>
<A HREF="../../../src/nep/tutorials/ex22f.F90.html">src/nep/tutorials/ex22f.F90</A><BR>
<A HREF="../../../src/nep/tutorials/ex27.c.html">src/nep/tutorials/ex27.c</A><BR>
<A HREF="../../../src/nep/tutorials/ex27f.F90.html">src/nep/tutorials/ex27f.F90</A><BR>
<A HREF="../../../src/nep/tutorials/ex42.c.html">src/nep/tutorials/ex42.c</A><BR>
<A HREF="../../../src/nep/tutorials/nlevp/gun.c.html">src/nep/tutorials/nlevp/gun.c</A><BR>
<A HREF="../../../src/nep/tutorials/nlevp/loaded_string.c.html">src/nep/tutorials/nlevp/loaded_string.c</A><BR>
<BR><BR><A HREF="./index.html">Index of all NEP routines</A>
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