PETSc version 3.15.5

MatSetOptionsPrefix

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

#include "petscmat.h" 
PetscErrorCode MatSetOptionsPrefix(Mat A,const char prefix[])

Logically Collective on Mat

	A	- the Mat context
	prefix	- the prefix to prepend to all option names

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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