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: