Actual source code: ex41.c

  1: static char help[] = "Nest vector set subvector functionality.\n\n";

  3: #include <petscvec.h>

  5: PetscErrorCode test_vec_ops(void)
  6: {
  7:   Vec            X,Y,a,b;
  8:   Vec            c,d,e,f,g,h;
  9:   PetscScalar    val;
 10:   PetscInt       tmp_ind[2];
 11:   Vec            tmp_buf[2];

 13:   PetscPrintf(PETSC_COMM_WORLD, "============== %s ==============\n",PETSC_FUNCTION_NAME);

 15:   /* create 4 worker vectors */
 16:   VecCreate(PETSC_COMM_WORLD, &c);
 17:   VecSetSizes(c, PETSC_DECIDE, 4);
 18:   VecSetType(c, VECMPI);
 19:   VecDuplicate(c, &d);
 20:   VecDuplicate(c, &e);
 21:   VecDuplicate(c, &f);

 23:   /* create two more workers of different sizes */
 24:   VecCreate(PETSC_COMM_WORLD, &g);
 25:   VecSetSizes(g, PETSC_DECIDE, 6);
 26:   VecSetType(g, VECMPI);
 27:   VecCreate(PETSC_COMM_WORLD, &h);
 28:   VecSetSizes(h, PETSC_DECIDE, 8);
 29:   VecSetType(h, VECMPI);

 31:   /* set the 6 vectors to some numbers */
 32:   VecSet(c, 1.0);
 33:   VecSet(d, 2.0);
 34:   VecSet(e, 3.0);
 35:   VecSet(f, 4.0);
 36:   VecSet(g, 5.0);
 37:   VecSet(h, 6.0);

 39:   /* assemble a */
 40:   PetscPrintf(PETSC_COMM_WORLD, "a = [c d] \n");
 41:   tmp_buf[0] = c; tmp_buf[1] = d;

 43:   VecCreateNest(PETSC_COMM_WORLD,2,NULL,tmp_buf,&a);
 44:   VecView(a,PETSC_VIEWER_STDOUT_WORLD);
 45:   PetscPrintf(PETSC_COMM_WORLD, "a = [d c] \n");
 46:   VecNestSetSubVec(a, 1, c);
 47:   VecNestSetSubVec(a, 0, d);
 48:   VecAssemblyBegin(a);
 49:   VecAssemblyEnd(a);
 50:   VecView(a,PETSC_VIEWER_STDOUT_WORLD);

 52:   /* assemble b */
 53:   PetscPrintf(PETSC_COMM_WORLD, "b = [e f] \n");
 54:   tmp_buf[0] = e; tmp_buf[1] = f;

 56:   VecCreateNest(PETSC_COMM_WORLD,2,NULL,tmp_buf,&b);
 57:   VecView(b,PETSC_VIEWER_STDOUT_WORLD);
 58:   PetscPrintf(PETSC_COMM_WORLD, "b = [f e] \n");
 59:   VecNestSetSubVec(b, 1, e);
 60:   VecNestSetSubVec(b, 0, f);
 61:   VecAssemblyBegin(b);
 62:   VecAssemblyEnd(b);
 63:   VecView(b,PETSC_VIEWER_STDOUT_WORLD);

 65:   PetscPrintf(PETSC_COMM_WORLD, "X = [a b] \n");
 66:   tmp_buf[0] = a; tmp_buf[1] = b;

 68:   VecCreateNest(PETSC_COMM_WORLD,2,NULL,tmp_buf,&X);
 69:   VecView(X,PETSC_VIEWER_STDOUT_WORLD);
 70:   VecDot(X,X, &val);
 71:   PetscPrintf(PETSC_COMM_WORLD, "X.X = %g \n", (double)PetscRealPart(val));

 73:   PetscPrintf(PETSC_COMM_WORLD, "X = [b a] \n");
 74:   /* re-order components of X */
 75:   VecNestSetSubVec(X,1,a);
 76:   VecNestSetSubVec(X,0,b);
 77:   VecAssemblyBegin(X);
 78:   VecAssemblyEnd(X);
 79:   VecView(X,PETSC_VIEWER_STDOUT_WORLD);
 80:   VecDot(X,X,&val);
 81:   PetscPrintf(PETSC_COMM_WORLD, "X.X = %g \n", (double)PetscRealPart(val));

 83:   /* re-assemble X */
 84:   PetscPrintf(PETSC_COMM_WORLD, "X = [g h] \n");
 85:   VecNestSetSubVec(X,1,g);
 86:   VecNestSetSubVec(X,0,h);
 87:   VecAssemblyBegin(X);
 88:   VecAssemblyEnd(X);
 89:   VecView(X,PETSC_VIEWER_STDOUT_WORLD);
 90:   VecDot(X,X,&val);
 91:   PetscPrintf(PETSC_COMM_WORLD, "X.X = %g \n", (double)PetscRealPart(val));

 93:   PetscPrintf(PETSC_COMM_WORLD, "Y = X \n");
 94:   VecDuplicate(X, &Y);
 95:   VecCopy(X,Y);
 96:   VecView(Y,PETSC_VIEWER_STDOUT_WORLD);
 97:   VecDot(Y,Y,&val);
 98:   PetscPrintf(PETSC_COMM_WORLD, "Y.Y = %g \n", (double)PetscRealPart(val));

100:   PetscPrintf(PETSC_COMM_WORLD, "Y = [a b] \n");
101:   tmp_buf[0] = a; tmp_buf[1] = b;
102:   tmp_ind[0] = 0; tmp_ind[1] = 1;

104:   VecNestSetSubVecs(Y,2,tmp_ind,tmp_buf);
105:   VecView(Y,PETSC_VIEWER_STDOUT_WORLD);

107:   VecDestroy(&c);
108:   VecDestroy(&d);
109:   VecDestroy(&e);
110:   VecDestroy(&f);
111:   VecDestroy(&g);
112:   VecDestroy(&h);
113:   VecDestroy(&a);
114:   VecDestroy(&b);
115:   VecDestroy(&X);
116:   VecDestroy(&Y);
117:   return 0;
118: }

120: int main(int argc, char **args)
121: {

123:   PetscInitialize(&argc, &args,(char*)0, help);
124:   test_vec_ops();
125:   PetscFinalize();
126:   return 0;
127: }

129: /*TEST

131:    test:

133: TEST*/