MatSetRandom#

Sets all components of a matrix to random numbers.

Synopsis#

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

Logically Collective

x - the matrix
rctx - the PetscRandom object, formed by PetscRandomCreate(), or NULL and it will create one internally.

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

For sparse matrices that have been preallocated but not been assembled, it randomly selects appropriate locations,

for sparse matrices that already have nonzero locations, it fills the locations with random numbers.

It generates an error if used on unassembled sparse matrices that have not been preallocated.

intermediate