STFilterSetInterval#

Defines the interval containing the desired eigenvalues.

Synopsis#

#include "slepcst.h" 
PetscErrorCode STFilterSetInterval(ST st,PetscReal inta,PetscReal intb)

Logically Collective

Input Parameters#

  • st - the spectral transformation context

  • inta - left end of the interval

  • intb - right end of the interval

Options Database Key#

  • -st_filter_interval <a,b> - set [a,b] as the interval of interest

Notes#

The filter will be configured to emphasize eigenvalues contained in the given interval, and damp out eigenvalues outside it. If the interval is open, then the filter is low- or high-pass, otherwise it is mid-pass.

Common usage is to set the interval in EPS with EPSSetInterval().

The interval must be contained within the numerical range of the matrix, see STFilterSetRange().

See Also#

ST: Spectral Transformation, STFILTER, STFilterGetInterval(), STFilterSetRange(), EPSSetInterval()

Level#

intermediate

Location#

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

Implementations#

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

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