slepc-3.22.2 2024-12-02
PEPSetInterval
Defines the computational interval for spectrum slicing.
Synopsis
#include "slepcpep.h"
PetscErrorCode PEPSetInterval(PEP pep,PetscReal inta,PetscReal intb)
Logically Collective
Input Parameters
| pep | - eigensolver context
|
| inta | - left end of the interval
|
| intb | - right end of the interval
|
Options Database Key
| -pep_interval <a,b> | - set [a,b] as the interval of interest
|
Notes
Spectrum slicing is a technique employed for computing all eigenvalues of
symmetric eigenproblems in a given interval. This function provides the
interval to be considered. It must be used in combination with PEP_ALL, see
PEPSetWhichEigenpairs().
In the command-line option, two values must be provided. For an open interval,
one can give an infinite, e.g., -pep_interval 1.0,inf or -pep_interval -inf,1.0.
An open interval in the programmatic interface can be specified with
PETSC_MAX_REAL and -PETSC_MAX_REAL.
See Also
PEPGetInterval(), PEPSetWhichEigenpairs()
Level
intermediate
Location
src/pep/interface/pepbasic.c
Examples
src/pep/tutorials/ex38.c
src/pep/tutorials/ex40.c
Index of all PEP routines
Table of Contents for all manual pages
Index of all manual pages