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:    mpirun -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:   int            event;
 19:   PetscRandom    rnd;
 20:   PetscScalar    value;
 22:   PetscMPIInt    rank,view_rank=-1;

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

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

 49: 
 50:   PetscRandomSeed(rnd);
 51:   for (i=0; i<n; i++) {
 52:     PetscRandomGetValue(rnd,&value);
 53:     values[i] = (PetscInt)(n*PetscRealPart(value) + 2.0);
 54:     /* printf("value[%d] = %g\n",i,value); */
 55:   }
 56:   PetscSortInt(n,values);

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

 65:   PetscFinalize();
 66:   return 0;
 67: }
 68: