petsc-3.14.5 2021-03-03
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# PetscObjectSetOptionsPrefix

Sets the prefix used for searching for all options of PetscObjectType in the database.

### Synopsis

    #include "petscsys.h"
    PetscErrorCode  PetscObjectSetOptionsPrefix(PetscObject obj,const char prefix[])

Collective on Object

### Input Parameters

| obj | - any PETSc object, for example a Vec, Mat or KSP.
| prefix | - the prefix string to prepend to option requests of the object.

### Notes

A hyphen (-) must NOT be given at the beginning of the prefix name. The first character of all runtime options is AUTOMATICALLY the hyphen.

### See Also

PetscOptionsCreate(), PetscOptionsDestroy(), PetscObjectAppendOptionsPrefix(), PetscObjectPrependOptionsPrefix(),
PetscObjectGetOptionsPrefix(), TSSetOptionsPrefix(), SNESSetOptionsPrefix(), KSPSetOptionsPrefix()

### Level

advanced

### Location

src/sys/objects/prefix.c

### Examples

src/snes/tutorials/ex56.c.html
src/ts/tutorials/ex11.c.html
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