2: static char help[] = "Tests MatTranspose() and MatEqual() for MPIAIJ matrices.\n\n";

  4:  #include <petscmat.h>


  7: int main(int argc,char **argv)
  8: {
  9:   Mat            A,B;
 10:   PetscInt       m = 7,n,i,rstart,rend,cols[3];
 12:   PetscScalar    v[3];
 13:   PetscBool      equal;
 14:   const char     *eq[2];

 16:   PetscInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr;
 17:   PetscOptionsGetInt(NULL,NULL,"-m",&m,NULL);
 18:   n    = m;

 20:   /* ------- Assemble matrix, --------- */

 22:   MatCreateAIJ(PETSC_COMM_WORLD,PETSC_DECIDE,PETSC_DECIDE,m,n,0,0,0,0,&A);
 23:   MatSetOption(A,MAT_NEW_NONZERO_LOCATION_ERR,PETSC_FALSE);
 24:   MatGetOwnershipRange(A,&rstart,&rend);
 25:   if (!rstart) {
 26:     cols[0] = 0;
 27:     cols[1] = 1;
 28:     v[0]    = 2.0; v[1] = -1.0;
 29:     MatSetValues(A,1,&rstart,2,cols,v,INSERT_VALUES);
 30:     rstart++;
 31:   }
 32:   if (rend == m) {
 33:     rend--;
 34:     cols[0] = rend-1;
 35:     cols[1] = rend;
 36:     v[0]    = -1.0; v[1] = 2.0;
 37:     MatSetValues(A,1,&rend,2,cols,v,INSERT_VALUES);
 38:   }
 39:   v[0] = -1.0; v[1] = 2.0; v[2] = -1.0;
 40:   for (i=rstart; i<rend; i++) {
 41:     cols[0] = i-1;
 42:     cols[1] = i;
 43:     cols[2] = i+1;
 44:     MatSetValues(A,1,&i,3,cols,v,INSERT_VALUES);
 45:   }
 46:   MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY);
 47:   MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY);

 49:   MatTranspose(A,MAT_INITIAL_MATRIX,&B);

 51:   MatEqual(A,B,&equal);

 53:   eq[0] = "not equal";
 54:   eq[1] = "equal";
 55:   PetscPrintf(PETSC_COMM_WORLD,"Matrices are %s\n",eq[equal]);

 57:   /* Free data structures */
 58:   MatDestroy(&A);
 59:   MatDestroy(&B);


 62:   PetscFinalize();
 63:   return ierr;
 64: }