R object that represents the triangulation of a set of 2D points,
generated by `tri.mesh`

or `add.constraint`

.

`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` |
Set of pointers in one-to-one
correspondence with the elements of |

`tlend` |
Set of pointers to adjacency lists. |

`tlnew` |
Pointer to the first empty location in |

`nc` |
number of constraints |

`lc` |
starting indices of constraints in |

`call` |
call, which generated this object |

The elements `tlist`

, `tlptr`

, `tlend`

and `tlnew`

are mainly intended for internal use in the appropriate Fortran
routines.

A. Gebhardt

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

`tri.mesh`

, `print.tri`

, `plot.tri`

, `summary.tri`

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