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

  9: int main(int argc,char **args)
 10: {
 11:   Mat         C;
 12:   int         i,j,m = 3,n = 2,rank,size,I,J,ierr,col = 0;
 13:   PetscScalar v;
 14:   Vec         yy;

 16:   PetscInitialize(&argc,&args,(char *)0,help);
 17:   PetscOptionsGetInt(PETSC_NULL,"-col",&col,PETSC_NULL);

 19:   MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
 20:   MPI_Comm_size(PETSC_COMM_WORLD,&size);
 21:   n = 2*size;

 23:   /* create the matrix for the five point stencil, YET AGAIN*/
 24:   MatCreateMPIAIJ(PETSC_COMM_WORLD,PETSC_DECIDE,PETSC_DECIDE,
 25:          m*n,m*n,5,PETSC_NULL,5,PETSC_NULL,&C);
 26:   for (i=0; i<m; i++) {
 27:     for (j=2*rank; j<2*rank+2; j++) {
 28:       v = -1.0;  I = j + n*i;
 29:       if (i>0)   {J = I - n; MatSetValues(C,1,&I,1,&J,&v,INSERT_VALUES);}
 30:       if (i<m-1) {J = I + n; MatSetValues(C,1,&I,1,&J,&v,INSERT_VALUES);}
 31:       if (j>0)   {J = I - 1; MatSetValues(C,1,&I,1,&J,&v,INSERT_VALUES);}
 32:       if (j<n-1) {J = I + 1; MatSetValues(C,1,&I,1,&J,&v,INSERT_VALUES);}
 33:       v = 4.0; MatSetValues(C,1,&I,1,&I,&v,INSERT_VALUES);
 34:     }
 35:   }
 36:   MatAssemblyBegin(C,MAT_FINAL_ASSEMBLY);
 37:   MatAssemblyEnd(C,MAT_FINAL_ASSEMBLY);
 38:   MatView(C,PETSC_VIEWER_STDOUT_WORLD);

 40:   VecCreate(PETSC_COMM_WORLD,&yy);
 41:   VecSetSizes(yy,PETSC_DECIDE,m*n);
 42:   VecSetFromOptions(yy);

 44:   MatGetColumnVector(C,yy,col);

 46:   VecView(yy,PETSC_VIEWER_STDOUT_WORLD);

 48:   VecDestroy(yy);
 49:   MatDestroy(C);
 50:   PetscFinalize();
 51:   return 0;
 52: }