petsc-3.8.4 2018-03-24
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PetscOptionsGetString

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

Synopsis

#include "petscsys.h"   
PetscErrorCode  PetscOptionsGetString(PetscOptions options,const char pre[],const char name[],char string[],size_t len,PetscBool  *set)
Not Collective

Input Parameters

options - options database, use NULL for default global database
pre - string to prepend to name or NULL
name - the option one is seeking
len - maximum length of the string including null termination

Output Parameters

string - location to copy string
set - PETSC_TRUE if found, else PETSC_FALSE

Fortran Note

The Fortran interface is slightly different from the C/C++ interface (len is not used). Sample usage in Fortran follows 
      character *20    string
      PetscErrorCode   ierr
      PetscBool        set
      call PetscOptionsGetString(PETSC_NULL_OPTIONS,PETSC_NULL_CHARACTER,'-s',string,set,ierr)

Notes: if the option is given but no string is provided then an empty string is returned and set is given the value of PETSC_TRUE

Note

Even if the user provided no string (for example -optionname -someotheroption) the flag is set to PETSC_TRUE (and the string is fulled with nulls).

See Also

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

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

Examples

src/sys/examples/tutorials/ex5.c.html
src/sys/examples/tutorials/ex9.c.html
src/sys/examples/tutorials/ex10f90.F90.html
src/mat/examples/tutorials/ex1.c.html
src/mat/examples/tutorials/ex5.c.html
src/mat/examples/tutorials/ex9.c.html
src/mat/examples/tutorials/ex10.c.html
src/mat/examples/tutorials/ex12.c.html
src/mat/examples/tutorials/ex16.c.html
src/ksp/ksp/examples/tutorials/ex10.c.html
src/ksp/ksp/examples/tutorials/ex27.c.html