Actual source code: ex18.c
2: static char help[] = "Compares BLAS dots on different machines. Input\n\
3: arguments are\n\
4: -n <length> : local vector length\n\n";
6: #include <petscvec.h>
8: int main(int argc,char **argv)
9: {
11: PetscInt n = 15,i;
12: PetscScalar v;
13: Vec x,y;
15: PetscInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr;
16: PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL);
17: if (n < 5) n = 5;
19: /* create two vectors */
20: VecCreateSeq(PETSC_COMM_SELF,n,&x);
21: VecCreateSeq(PETSC_COMM_SELF,n,&y);
23: for (i=0; i<n; i++) {
24: v = ((PetscReal)i) + 1.0/(((PetscReal)i) + .35);
25: VecSetValues(x,1,&i,&v,INSERT_VALUES);
26: v += 1.375547826473644376;
27: VecSetValues(y,1,&i,&v,INSERT_VALUES);
28: }
29: VecAssemblyBegin(y);
30: VecAssemblyEnd(y);
32: VecDot(x,y,&v);
33: PetscFPrintf(PETSC_COMM_WORLD,stdout,"Vector inner product %16.12e\n",(double)PetscRealPart(v));
35: VecDestroy(&x);
36: VecDestroy(&y);
38: PetscFinalize();
39: return ierr;
40: }
42: /*TEST
44: test:
46: TEST*/