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

• dvalue - the double value to return

• set - PETSC_TRUE if found, PETSC_FALSE if not found

Notes

Accepts the special values determine, decide and unlimited.

Accepts the deprecated value default

If the user does not supply the option dvalue is NOT changed. Thus you should ALWAYS initialize dvalue if you access it without first checking that 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/ts/tutorials/ex20opt_p.c
src/ts/tutorials/ex20fwd.c
src/ts/tutorials/ex1f.F90
src/dm/impls/stag/tutorials/ex6.c
src/ts/tutorials/ex27.c
src/ts/tutorials/ex22f.F90
src/ts/tutorials/ex20adj.c
src/dm/impls/plex/tutorials/ex10.c
src/dm/tutorials/ex26.c
src/ts/tutorials/ex6.c

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