Actual source code: ex25.c


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

  4: #include <petscmat.h>

  6: int main(int argc,char **args)
  7: {
  8:   Mat            C,A;
  9:   PetscScalar    v;
 10:   PetscInt       i,j,m = 4,n = 4,Ii,J,Istart,Iend;
 11:   PetscMPIInt    rank,size;
 12:   PetscBool      equal=PETSC_FALSE;

 14:   PetscInitialize(&argc,&args,(char*)0,help);
 15:   MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
 16:   MPI_Comm_size(PETSC_COMM_WORLD,&size);

 18:   PetscOptionsGetInt(NULL,NULL,"-m",&m,NULL);
 19:   n    = m;

 21:   MatCreateAIJ(PETSC_COMM_WORLD,PETSC_DECIDE,PETSC_DECIDE,m*n,m*n,5,NULL,5,NULL,&C);

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

 36:   MatTranspose(C,MAT_INITIAL_MATRIX,&A);

 38:   MatEqual(C,A,&equal);

 41:   MatDestroy(&C);
 42:   MatDestroy(&A);
 43:   PetscFinalize();
 44:   return 0;
 45: }

 47: /*TEST

 49:    test:

 51: TEST*/