Actual source code: ex1.c

  2: static char help[] = "Tests PetscRandom functions.\n\n";

 4:  #include petsc.h
 5:  #include petscsys.h

  7: /* Usage: 
  8:    mpiexec -np <np> ./ex1 -n <num_of_random_numbers> -random_type <type> -log_summary
  9:                          -view_randomvalues <view_rank> 
 10:                          -random_view ascii -random_view_file <filename>
 11: */

 15: int main(int argc,char **argv)
 16: {
 17:   PetscInt       i,n = 1000,*values;
 18:   PetscRandom    rnd;
 19:   PetscScalar    value;
 21:   PetscMPIInt    rank,view_rank=-1;
 22: #if defined (PETSC_USE_LOG)
 23:   int            event;
 24: #endif

 26:   PetscInitialize(&argc,&argv,(char *)0,help);
 27:   MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
 28:   PetscOptionsGetInt(PETSC_NULL,"-n",&n,PETSC_NULL);
 29:   PetscOptionsGetInt(PETSC_NULL,"-view_randomvalues",&view_rank,PETSC_NULL);
 30: 
 31:   PetscRandomCreate(PETSC_COMM_WORLD,&rnd);
 32: #if defined(PETSC_HAVE_DRAND48)
 33:   PetscRandomSetType(rnd,PETSCRAND48);
 34: #elif defined(PETSC_HAVE_RAND)
 35:   PetscRandomSetType(rnd,PETSCRAND);
 36: #endif
 37:   PetscRandomSetFromOptions(rnd);

 39:   PetscMalloc(n*sizeof(PetscInt),&values);
 40:   for (i=0; i<n; i++) {
 41:     PetscRandomGetValue(rnd,&value);
 42:     if (view_rank == rank) {
 43:       PetscPrintf(PETSC_COMM_SELF,"[%D] value[%d] = %g\n",rank,i,PetscRealPart(value));
 44:     }
 45:     values[i] = (PetscInt)(n*PetscRealPart(value) + 2.0);
 46:   }
 47:   PetscSortInt(n,values);

 51: 
 52:   PetscRandomSeed(rnd);
 53:   for (i=0; i<n; i++) {
 54:     PetscRandomGetValue(rnd,&value);
 55:     values[i] = (PetscInt)(n*PetscRealPart(value) + 2.0);
 56:     /* printf("value[%d] = %g\n",i,value); */
 57:   }
 58:   PetscSortInt(n,values);

 61:   for (i=1; i<n; i++) {
 62:     if (values[i] < values[i-1]) SETERRQ(1,"Values not sorted");
 63:   }
 64:   PetscFree(values);
 65:   PetscRandomDestroy(rnd);

 67:   PetscFinalize();
 68:   return 0;
 69: }
 70: