#include "petscsys.h" PetscErrorCode PetscOptionsGetReal(PetscOptions options,const char pre[],const char name[],PetscReal *dvalue,PetscBool *set)Not Collective
| options | - options database, use NULL for default global database | |
| pre | - string to prepend to each name or NULL | |
| name | - the option one is seeking |
| dvalue | - the double value to return | |
| set | - PETSC_TRUE if found, PETSC_FALSE if not found |