petsc-3.8.4 2018-03-24

MatSetRandom

Sets all components of a matrix to random numbers. For sparse matrices that have been preallocated it randomly selects appropriate locations

#include "petscmat.h" 
PetscErrorCode MatSetRandom(Mat x,PetscRandom rctx)

Logically Collective on Vec

	x	- the vector
	rctx	- the random number context, formed by PetscRandomCreate(), or NULL and it will create one internally.

x -the vector

     PetscRandomCreate(PETSC_COMM_WORLD,&rctx);
     MatSetRandom(x,rctx);
     PetscRandomDestroy(rctx);