petsc-3.6.1 2015-08-06
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PetscOptionsReal

 Gets the PetscReal value for a particular option in the database.

Synopsis

#include "petscsys.h"   
PetscErrorCode  PetscOptionsReal_Private(PetscOptions *PetscOptionsObject,const char opt[],const char text[],const char man[],PetscReal currentvalue,PetscReal *value,PetscBool  *set)
Logically Collective on the communicator passed in PetscOptionsBegin()

Input Parameters

opt - option name
text - short string that describes the option
man - manual page with additional information on option
currentvalue - the current value; caller is responsible for setting this value correctly. Normally this is done with either 
                PetscOptionsReal(..., obj->value,&object->value,...) or

                value = defaultvalue

                PetscOptionsReal(..., value,&value,&flg);

                if (flg) {

Output Parameter

value - the value to return
flg - PETSC_TRUE if found, else PETSC_FALSE

Notes: Must be between a PetscOptionsBegin() and a PetscOptionsEnd()

See Also

PetscOptionsGetReal(), PetscOptionsHasName(), PetscOptionsGetString(), PetscOptionsGetInt(),
PetscOptionsGetIntArray(), PetscOptionsGetRealArray(), PetscOptionsBool() PetscOptionsInt(), PetscOptionsString(), PetscOptionsReal(), PetscOptionsBool(), PetscOptionsName(), PetscOptionsBegin(), PetscOptionsEnd(), PetscOptionsHead(), PetscOptionsStringArray(),PetscOptionsRealArray(), PetscOptionsScalar(), PetscOptionsBoolGroupBegin(), PetscOptionsBoolGroup(), PetscOptionsBoolGroupEnd(), PetscOptionsFList(), PetscOptionsEList()

Level:beginner
Location:src/sys/objects/aoptions.c
Index of all Sys routines
Table of Contents for all manual pages
Index of all manual pages

Examples

src/ksp/ksp/examples/tutorials/ex29.c.html
src/ksp/ksp/examples/tutorials/ex56.c.html
src/snes/examples/tutorials/ex12.c.html
src/snes/examples/tutorials/ex15.c.html
src/snes/examples/tutorials/ex46.c.html
src/snes/examples/tutorials/ex48.c.html
src/snes/examples/tutorials/ex62.c.html
src/ts/examples/tutorials/ex8.c.html
src/ts/examples/tutorials/ex9.c.html
src/ts/examples/tutorials/ex10.c.html
src/ts/examples/tutorials/ex11.c.html