Actual source code: ex60.c
1: /*$Id: ex60.c,v 1.15 2001/09/11 16:32:50 bsmith Exp $*/
3: static char help[] = "Tests MatGetColumnVector().";
5: #include petscmat.h
7: int main(int argc,char **args)
8: {
9: Mat C;
10: int i,j,m = 3,n = 2,rank,size,I,J,ierr,col = 0;
11: PetscScalar v;
12: Vec yy;
14: PetscInitialize(&argc,&args,(char *)0,help);
15: PetscOptionsGetInt(PETSC_NULL,"-col",&col,PETSC_NULL);
17: MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
18: MPI_Comm_size(PETSC_COMM_WORLD,&size);
19: n = 2*size;
21: /* create the matrix for the five point stencil, YET AGAIN*/
22: MatCreateMPIAIJ(PETSC_COMM_WORLD,PETSC_DECIDE,PETSC_DECIDE,
23: m*n,m*n,5,PETSC_NULL,5,PETSC_NULL,&C);
24: for (i=0; i<m; i++) {
25: for (j=2*rank; j<2*rank+2; j++) {
26: v = -1.0; I = j + n*i;
27: if (i>0) {J = I - n; MatSetValues(C,1,&I,1,&J,&v,INSERT_VALUES);}
28: if (i<m-1) {J = I + n; MatSetValues(C,1,&I,1,&J,&v,INSERT_VALUES);}
29: if (j>0) {J = I - 1; MatSetValues(C,1,&I,1,&J,&v,INSERT_VALUES);}
30: if (j<n-1) {J = I + 1; MatSetValues(C,1,&I,1,&J,&v,INSERT_VALUES);}
31: v = 4.0; MatSetValues(C,1,&I,1,&I,&v,INSERT_VALUES);
32: }
33: }
34: MatAssemblyBegin(C,MAT_FINAL_ASSEMBLY);
35: MatAssemblyEnd(C,MAT_FINAL_ASSEMBLY);
36: MatView(C,PETSC_VIEWER_STDOUT_WORLD);
38: VecCreate(PETSC_COMM_WORLD,&yy);
39: VecSetSizes(yy,PETSC_DECIDE,m*n);
40: VecSetFromOptions(yy);
42: MatGetColumnVector(C,yy,col);
44: VecView(yy,PETSC_VIEWER_STDOUT_WORLD);
46: VecDestroy(yy);
47: MatDestroy(C);
48: PetscFinalize();
49: return 0;
50: }