STFilterSetRange#

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

Synopsis#

#include "slepcst.h" 
PetscErrorCode STFilterSetRange(ST st,PetscReal left,PetscReal right)

Logically Collective

Input Parameters#

  • st - the spectral transformation context

  • left - left end of the interval

  • right - right end of the interval

Options Database Key#

  • -st_filter_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, left and right are good approximations to the leftmost and rightmost eigenvalues, respectively.

See Also#

STFilterGetRange(), STFilterSetInterval()

Level#

intermediate

Location#

src/sys/classes/st/impls/filter/filter.c

Implementations#

STFilterSetRange_Filter() in src/sys/classes/st/impls/filter/filter.c

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