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.nn";
5: #include petscmat.h
7: int main(int argc,char **args)
8: {
9: int ierr,m = 4,n = 5,i,j,I,J;
10: PetscScalar one = 1.0,v;
11: Vec x;
12: Mat A;
13: PetscViewer viewer;
15: PetscInitialize(&argc,&args,(char *)0,help);
16: PetscOptionsGetInt(PETSC_NULL,"-m",&m,PETSC_NULL);
17: PetscOptionsGetInt(PETSC_NULL,"-n",&n,PETSC_NULL);
19: PetscViewerSocketOpen(PETSC_COMM_WORLD,"eagle",-1,&viewer);
20: MatCreate(PETSC_COMM_WORLD,PETSC_DECIDE,PETSC_DECIDE,m*n,m*n,&A);
21: MatSetFromOptions(A);
23: for (i=0; i<m; i++) {
24: for (j=0; j<n; j++) {
25: v = -1.0; I = j + n*i;
26: if (i>0) {J = I - n; MatSetValues(A,1,&I,1,&J,&v,INSERT_VALUES);}
27: if (i<m-1) {J = I + n; MatSetValues(A,1,&I,1,&J,&v,INSERT_VALUES);}
28: if (j>0) {J = I - 1; MatSetValues(A,1,&I,1,&J,&v,INSERT_VALUES);}
29: if (j<n-1) {J = I + 1; MatSetValues(A,1,&I,1,&J,&v,INSERT_VALUES);}
30: v = 4.0; MatSetValues(A,1,&I,1,&I,&v,INSERT_VALUES);
31: }
32: }
33: MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY);
34: MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY);
36: MatView(A,viewer);
38: VecCreateSeq(PETSC_COMM_SELF,m,&x);
39: VecSet(&one,x);
40: VecView(x,viewer);
41:
42: PetscSleep(30);
43: PetscObjectDestroy((PetscObject)viewer);
45: VecDestroy(x);
46: MatDestroy(A);
47: PetscFinalize();
48: return 0;
49: }
50: