petsc-3.12.1 2019-10-22
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# VecSetRandom

Sets all components of a vector to random numbers.

### Synopsis

    #include "petscvec.h"
    PetscErrorCode  VecSetRandom(Vec x,PetscRandom rctx)

Logically Collective on Vec

### Input Parameters

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

### Output Parameter

x -the vector

### Example of Usage

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

### See Also

VecSet(), VecSetValues(), PetscRandomCreate(), PetscRandomDestroy()

### Level

intermediate

### Location

src/vec/vec/interface/vector.c

### Examples

src/ksp/pc/examples/tutorials/ex3.c.html
src/ksp/ksp/examples/tutorials/ex5.c.html
src/ksp/ksp/examples/tutorials/ex10.c.html
src/ksp/ksp/examples/tutorials/ex11.c.html
src/ksp/ksp/examples/tutorials/ex18.c.html
src/ksp/ksp/examples/tutorials/ex46.c.html
src/ksp/ksp/examples/tutorials/ex52.c.html
src/ksp/ksp/examples/tutorials/ex59.c.html
src/ksp/ksp/examples/tutorials/ex2f.F90.html
src/ksp/ksp/examples/tutorials/ex11f.F90.html
src/ksp/ksp/examples/tutorials/ex5f.F90.html

### Implementations

VecSetRandom_Seq in src/vec/vec/impls/seq/bvec2.c
VecSetRandom_SeqCUDA in src/vec/vec/impls/seq/seqcuda/veccuda.c
VecSetRandom_SeqViennaCL in src/vec/vec/impls/seq/seqviennacl/vecviennacl.cxx
Index of all Vec routines
Table of Contents for all manual pages
Index of all manual pages