PETSc version 3.16.6

PCSetOptionsPrefix

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

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

Logically Collective on PC

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

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

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