Actual source code: ex25.c

  1: /*$Id: ex25.c,v 1.17 2001/08/07 03:03:07 balay Exp $*/

  3: static char help[] = "Tests MatTranspose()\n\n";

 5:  #include petscmat.h

  9: int main(int argc,char **args)
 10: {
 11:   Mat     C,A;
 12:   PetscScalar  v;
 13:   int     i,j,m = 4,n = 4,rank,size,I,J,ierr,Istart,Iend;

 15:   PetscInitialize(&argc,&args,(char *)0,help);
 16:   MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
 17:   MPI_Comm_size(PETSC_COMM_WORLD,&size);
 18: 
 19:   MatCreateMPIAIJ(PETSC_COMM_WORLD,PETSC_DECIDE,PETSC_DECIDE,
 20:          m*n,m*n,5,PETSC_NULL,5,PETSC_NULL,&C);

 22:   /* create the matrix for the five point stencil, YET AGAIN*/
 23:   MatGetOwnershipRange(C,&Istart,&Iend);
 24:   for (I=Istart; I<Iend; I++) {
 25:     v = -1.0; i = I/n; j = I - i*n;
 26:     if (i>0)   {J = I - n; MatSetValues(C,1,&I,1,&J,&v,INSERT_VALUES);}
 27:     if (i<m-1) {J = I + n; MatSetValues(C,1,&I,1,&J,&v,INSERT_VALUES);}
 28:     if (j>0)   {J = I - 1; MatSetValues(C,1,&I,1,&J,&v,INSERT_VALUES);}
 29:     if (j<n-1) {J = I + 1; MatSetValues(C,1,&I,1,&J,&v,INSERT_VALUES);}
 30:     v = 4.0; MatSetValues(C,1,&I,1,&I,&v,INSERT_VALUES);
 31:   }
 32:   MatAssemblyBegin(C,MAT_FINAL_ASSEMBLY);
 33:   MatAssemblyEnd(C,MAT_FINAL_ASSEMBLY);
 34:   MatView(C,PETSC_VIEWER_STDOUT_WORLD);

 36:   MatTranspose(C,&A);
 37:   MatView(A,PETSC_VIEWER_STDOUT_WORLD);

 39:   MatDestroy(C);
 40:   MatDestroy(A);
 41:   PetscFinalize();
 42:   return 0;
 43: }