PetscOptionsGetReal#

Gets the double precision value for a particular option in the database.

Synopsis#

#include "petscsys.h"   
PetscErrorCode PetscOptionsGetReal(PetscOptions options, const char pre[], const char name[], PetscReal *dvalue, PetscBool *set)

Not Collective

Input Parameters#

  • options - options database, use NULL for default global database

  • pre - string to prepend to each name or NULL

  • name - the option one is seeking

Output Parameters#

Note#

If the user does not supply the option dvalue is NOT changed. Thus you should ALWAYS initialize the ivalue if you access it without first checking if the set flag is true.

See Also#

PetscOptionsGetInt(), PetscOptionsHasName(), PetscOptionsGetString(), PetscOptionsGetIntArray(), PetscOptionsGetRealArray(), PetscOptionsBool(), PetscOptionsName(), PetscOptionsBegin(), PetscOptionsEnd(), PetscOptionsHeadBegin(), PetscOptionsStringArray(), PetscOptionsRealArray(), PetscOptionsScalar(), PetscOptionsBoolGroupBegin(), PetscOptionsBoolGroup(), PetscOptionsBoolGroupEnd(), PetscOptionsFList(), PetscOptionsEList()

Level#

beginner

Location#

src/sys/objects/options.c

Examples#

src/sys/classes/random/tutorials/ex2.c.html
src/dm/impls/plex/tutorials/ex10.c.html
src/dm/impls/stag/tutorials/ex6.c.html
src/dm/tutorials/ex26.c.html
src/ksp/ksp/tutorials/ex11.c.html
src/ksp/ksp/tutorials/ex11f.F90.html
src/ksp/ksp/tutorials/ex21.c.html
src/ksp/ksp/tutorials/ex42.c.html
src/ksp/ksp/tutorials/ex43.c.html
src/ksp/ksp/tutorials/ex54.c.html
src/ksp/ksp/tutorials/ex54f.F90.html


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