RGIntervalSetEndpoints#

Sets the parameters defining the interval region.

Synopsis#

#include "slepcrg.h" 
PetscErrorCode RGIntervalSetEndpoints(RG rg,PetscReal a,PetscReal b,PetscReal c,PetscReal d)

Logically Collective

Input Parameters#

  • rg - the region context

  • a - left endpoint of the interval in the real axis

  • b - right endpoint of the interval in the real axis

  • c - bottom endpoint of the interval in the imaginary axis

  • d - top endpoint of the interval in the imaginary axis

Options Database Key#

  • -rg_interval_endpoints - comma-separated list of values (two or four)

Note#

The region is defined as \([a,b]\times[c,d]\). Particular cases are an interval on the real axis (\(c=d=0\)), similarly for the imaginary axis (\(a=b=0\)), the whole complex plane (\(a=-\infty,b=\infty,c=-\infty,d=\infty\)), and so on.

When PETSc is built with real scalars, the region must be symmetric with respect to the real axis.

See Also#

RG: Region, RGINTERVAL, RGIntervalGetEndpoints()

Level#

advanced

Location#

src/sys/classes/rg/impls/interval/rginterval.c

Examples#

src/eps/tutorials/ex30.c
src/nep/tutorials/ex27.c
src/nep/tutorials/ex27f.F90
src/nep/tutorials/ex42.c

Implementations#

RGIntervalSetEndpoints_Interval() in src/sys/classes/rg/impls/interval/rginterval.c

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