EPSEVSLSetRange#

Defines the numerical range (or field of values) of the problem, that is, the interval containing all eigenvalues.

Synopsis#

#include "slepceps.h" 
PetscErrorCode EPSEVSLSetRange(EPS eps,PetscReal lmin,PetscReal lmax)

Logically Collective

Input Parameters#

  • eps - the linear eigensolver context

  • lmin - left end of the interval

  • lmax - right end of the interval

Options Database Key#

  • -eps_evsl_range <a,b> - set [a,b] as the numerical range

Notes#

The filter will be most effective if the numerical range is tight, that is, lmin and lmax are good approximations to the leftmost and rightmost eigenvalues, respectively. If not set by the user, an approximation is computed internally.

The wanted computational interval specified via EPSSetInterval() must be contained in the numerical range.

See Also#

EPS: Eigenvalue Problem Solver, EPSEVSLGetRange(), EPSSetInterval()

Level#

intermediate

Location#

src/eps/impls/external/evsl/evsl.c

Implementations#

EPSEVSLSetRange_EVSL() in src/eps/impls/external/evsl/evsl.c

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