tri                 package:tripack                 R Documentation

_A _t_r_i_a_n_g_u_l_a_t_i_o_n _o_b_j_e_c_t

_D_e_s_c_r_i_p_t_i_o_n:

     R object that represents the triangulation of a set of 2D points, 
     generated by 'tri.mesh' or 'add.constraint'.

_A_r_g_u_m_e_n_t_s:

       n: Number of nodes

       x: x coordinates of the triangulation nodes

       y: y coordinates of the triangulation nodes

   tlist: Set of nodal indexes which, along with 'tlptr', 'tlend', and
          'tlnew', define the triangulation as a set of n adjacency
          lists - counterclockwise-ordered sequences of neighboring
          nodes such that the first and last neighbors of a boundary
          node are boundary nodes (the first neighbor of an interior
          node is arbitrary). In order to distinguish between interior
          and boundary nodes, the last neighbor of each boundary node
          is represented by the negative of its index.

   tlptr: Set of pointers in one-to-one correspondence with the
          elements of 'tlist'. 'tlist[tlptr[i]]' indexes the node which
          follows 'tlist[i]' in cyclical counterclockwise order (the
          first neighbor follows the last neighbor).

   tlend: Set of pointers to adjacency lists. 'tlend[k]' points to the
          last neighbor of node k for k = 1,...,n.  Thus,
          'tlist[\tlend[k]]'<0 if and only if k is a boundary node.

   tlnew: Pointer to the first empty location in 'tlist' and 'tlptr'
          (list length plus one).

      nc: number of constraints

      lc: starting indices of constraints in 'x' and 'y'

    call: call, which generated this object

_N_o_t_e:

     The elements 'tlist', 'tlptr', 'tlend' and 'tlnew' are mainly
     intended for internal use in the appropriate Fortran routines.

_A_u_t_h_o_r(_s):

     A. Gebhardt

_R_e_f_e_r_e_n_c_e_s:

     R. J. Renka (1996). Algorithm 751: TRIPACK: a constrained
     two-dimensional {Delaunay} triangulation package. ACM Transactions
     on Mathematical Software. *22*, 1-8.

_S_e_e _A_l_s_o:

     'tri.mesh', 'print.tri', 'plot.tri', 'summary.tri'

