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#
Level#
intermediate
Location#
Examples#
src/pep/tutorials/ex38.c
src/pep/tutorials/ex40.c
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