# PCSetOptionsPrefix

Sets the prefix used for searching for all PC options in the database.

### Synopsis

    #include "petscksp.h"
    PetscErrorCode PETSCKSP_DLLEXPORT PCSetOptionsPrefix(PC pc,const char prefix[])

Collective on PC

### Input Parameters

| pc | - the preconditioner context
| prefix | - the prefix string to prepend to all PC option requests

### 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.

### Keywords

PC, set, options, prefix, database

### See Also

PCAppendOptionsPrefix(), PCGetOptionsPrefix()

Level:advanced
Location:src/ksp/pc/interface/precon.c
Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages