# Nonlinear Eigenvalue Problem Solver - NEP

The Nonlinear Eigenvalue Problem (NEP) solver is the object provided by SLEPc for specifying an eigenvalue problem that is nonlinear with respect to the eigenvalue (not the eigenvector). This is intended for general nonlinear problems (rather than polynomial eigenproblems) described as T(λ)x= 0.

As in the other solver objects, users can set various options at runtime via the options database (e.g., -nep_nev 4 -nep_type narnoldi). Options can also be set directly in application codes by calling the corresponding routines (e.g., NEPSetDimensions() or NEPSetType()).

Examples

ex20.c: Simple 1-D nonlinear eigenproblem.
ex20f.F90: Simple 1-D nonlinear eigenproblem. Fortran90 equivalent of ex20.c
ex21.c: Simple 1-D nonlinear eigenproblem (matrix-free version).
ex22.c: Delay differential equation.
ex22f.F90: Delay differential equation. Fortran90 equivalent of ex22.c
ex27.c: Simple nonlinear eigenproblem using the NLEIGS solver.
ex27f.F90: Simple NLEIGS example. Fortran90 equivalent of ex27.c
ex42.c: Illustrates computation of left eigenvectors and resolvent.
ex54f.F90: Illustrates use of shell matrices in callback interface from Fortran.

Directories

nlevp