slepc-3.21.1 2024-04-26
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Defines the parameters used for computing the density of states (DOS) in the EVSL solver.


#include "slepceps.h" 
PetscErrorCode EPSEVSLSetDOSParameters(EPS eps,EPSEVSLDOSMethod dos,PetscInt nvec,PetscInt deg,PetscInt steps,PetscInt npoints)
Logically Collective

Input Parameters

eps  - the eigensolver context
dos  - DOS method, either KPM or Lanczos
nvec  - number of sample vectors
deg  - polynomial degree (KPM only)
steps  - number of Lanczos steps (Lanczos only)
npoints  - number of sample points (Lanczos only)

Options Database Keys

-eps_evsl_dos_method <dos>  - set the DOS method, either kpm or lanczos
-eps_evsl_dos_nvec <n>  - set the number of sample vectors
-eps_evsl_dos_degree <n>  - set the polynomial degree
-eps_evsl_dos_steps <n>  - set the number of Lanczos steps
-eps_evsl_dos_npoints <n>  - set the number of sample points


The density of states (or spectral density) can be approximated with two methods, kernel polynomial method (KPM) or Lanczos. Some parameters for these methods can be set by the user with this function, with some of them being relevant for one of the methods only.

See Also






Index of all EPS routines
Table of Contents for all manual pages
Index of all manual pages