Actual source code: ex71.c
1: /*$Id: ex71.c,v 1.45 2001/08/07 03:03:07 balay Exp $*/
3: static char help[] = "Passes a sparse matrix to Matlab.\n\n";
5: #include petscmat.h
9: int main(int argc,char **args)
10: {
11: int ierr,m = 4,n = 5,i,j,I,J;
12: PetscScalar one = 1.0,v;
13: Vec x;
14: Mat A;
15: PetscViewer viewer;
17: PetscInitialize(&argc,&args,(char *)0,help);
18: PetscOptionsGetInt(PETSC_NULL,"-m",&m,PETSC_NULL);
19: PetscOptionsGetInt(PETSC_NULL,"-n",&n,PETSC_NULL);
21: PetscViewerSocketOpen(PETSC_COMM_WORLD,"eagle",-1,&viewer);
22: MatCreate(PETSC_COMM_WORLD,PETSC_DECIDE,PETSC_DECIDE,m*n,m*n,&A);
23: MatSetFromOptions(A);
25: for (i=0; i<m; i++) {
26: for (j=0; j<n; j++) {
27: v = -1.0; I = j + n*i;
28: if (i>0) {J = I - n; MatSetValues(A,1,&I,1,&J,&v,INSERT_VALUES);}
29: if (i<m-1) {J = I + n; MatSetValues(A,1,&I,1,&J,&v,INSERT_VALUES);}
30: if (j>0) {J = I - 1; MatSetValues(A,1,&I,1,&J,&v,INSERT_VALUES);}
31: if (j<n-1) {J = I + 1; MatSetValues(A,1,&I,1,&J,&v,INSERT_VALUES);}
32: v = 4.0; MatSetValues(A,1,&I,1,&I,&v,INSERT_VALUES);
33: }
34: }
35: MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY);
36: MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY);
38: MatView(A,viewer);
40: VecCreateSeq(PETSC_COMM_SELF,m,&x);
41: VecSet(&one,x);
42: VecView(x,viewer);
43:
44: PetscSleep(30);
45: PetscObjectDestroy((PetscObject)viewer);
47: VecDestroy(x);
48: MatDestroy(A);
49: PetscFinalize();
50: return 0;
51: }
52: