MatSetRandom#
Sets all components of a matrix to random numbers.
Synopsis#
#include "petscmat.h"
PetscErrorCode MatSetRandom(Mat x, PetscRandom rctx)
Logically Collective
Input Parameters#
x - the matrix
rctx - the
PetscRandom
object, formed byPetscRandomCreate()
, orNULL
and it will create one internally.
Example#
PetscRandomCreate(PETSC_COMM_WORLD,&rctx);
MatSetRandom(x,rctx);
PetscRandomDestroy(rctx);
Notes#
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.
See Also#
Matrices, Mat
, PetscRandom
, PetscRandomCreate()
, MatZeroEntries()
, MatSetValues()
, PetscRandomDestroy()
Level#
intermediate
Location#
Examples#
src/tao/tutorials/ex4.c
src/ksp/ksp/tutorials/ex76f.F90
src/ksp/ksp/tutorials/ex77f.F90
src/ksp/ksp/tutorials/ex79.c
src/ksp/ksp/tutorials/ex81a.c
src/ksp/ksp/tutorials/ex76.c
src/ksp/ksp/tutorials/ex77.c
src/ksp/ksp/tutorials/ex81.c
src/mat/tutorials/ex9.c
Implementations#
MatSetRandom_MPIAIJ() in src/mat/impls/aij/mpi/mpiaij.c
MatSetRandom_SeqAIJ() in src/mat/impls/aij/seq/aij.c
MatSetRandom_MPIDense() in src/mat/impls/dense/mpi/mpidense.c
MatSetRandom_SeqDense() in src/mat/impls/dense/seq/dense.c
MatSetRandom_Nest() in src/mat/impls/nest/matnest.c
MatSetRandom_MPISELL() in src/mat/impls/sell/mpi/mpisell.c
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages