Actual source code: ex21.c

  2: static char help[] = "Tests VecMax() with index.\n\
  3:   -n <length> : vector length\n\n";

 5:  #include petscvec.h

  9: int main(int argc,char **argv)
 10: {
 12:   PetscInt       n = 5,idx;
 13:   PetscReal      value;
 14:   Vec            x;
 15:   PetscScalar    one = 1.0;

 17:   PetscInitialize(&argc,&argv,(char*)0,help);
 18:   PetscOptionsGetInt(PETSC_NULL,"-n",&n,PETSC_NULL);

 20:   /* create vector */
 21:   VecCreate(PETSC_COMM_WORLD,&x);
 22:   VecSetSizes(x,PETSC_DECIDE,n);
 23:   VecSetFromOptions(x);


 26:   VecSet(x,one);
 27:   VecSetValue(x,0,0.0,INSERT_VALUES);
 28:   VecSetValue(x,n-1,2.0,INSERT_VALUES);
 29:   VecAssemblyBegin(x);
 30:   VecAssemblyEnd(x);

 32:   VecView(x,PETSC_VIEWER_STDOUT_WORLD);
 33:   VecMax(x,&idx,&value);
 34:   PetscPrintf(PETSC_COMM_WORLD,"Maximum value %G index %D\n",value,idx);
 35:   VecMin(x,&idx,&value);
 36:   PetscPrintf(PETSC_COMM_WORLD,"Minimum value %G index %D\n",value,idx);

 38:   VecDestroy(x);

 40:   PetscFinalize();
 41:   return 0;
 42: }
 43: