Actual source code: ex18.c
2: /* np = 1 */
4: static char help[] = "Compares BLAS dots on different machines. Input\n\
5: arguments are\n\
6: -n <length> : local vector length\n\n";
8: #include petscvec.h
9: #include petscsys.h
13: int main(int argc,char **argv)
14: {
16: PetscInt n = 15,i;
17: PetscScalar v;
18: Vec x,y;
20: PetscInitialize(&argc,&argv,(char*)0,help);
21: PetscOptionsGetInt(PETSC_NULL,"-n",&n,PETSC_NULL);
22: if (n < 5) n = 5;
25: /* create two vectors */
26: VecCreateSeq(PETSC_COMM_SELF,n,&x);
27: VecCreateSeq(PETSC_COMM_SELF,n,&y);
29: for (i=0; i<n; i++) {
30: v = ((PetscReal)i) + 1.0/(((PetscReal)i) + .35);
31: VecSetValues(x,1,&i,&v,INSERT_VALUES);
32: v += 1.375547826473644376;
33: VecSetValues(y,1,&i,&v,INSERT_VALUES);
34: }
35: VecAssemblyBegin(y);
36: VecAssemblyEnd(y);
38: VecDot(x,y,&v);
39: PetscFPrintf(PETSC_COMM_WORLD,stdout,"Vector inner product %16.12e\n",v);
41: VecDestroy(x);
42: VecDestroy(y);
44: PetscFinalize();
45: return 0;
46: }
47: