Description Usage Arguments Details Value Note Author(s) Examples

These functions transform a matrix with three or four components to fit into a two- or three-dimensional simplex (triangle or tetrahedron).

1 2 3 4 5 6 7 | ```
toSimplex(x)
toTernary(abc)
toTernaryVectors(c1, c2, c3)
toQuaternary(abcd)
toQuaternaryVectors(c1, c2, c3, c4)
``` |

`x` |
a matrix-like object with 3 or 4 columns. |

`abc` |
a matrix-like object with 3 columns. |

`abcd` |
a matrix-like object with 4 columns. |

`c1` |
a numeric vector with values of the first component. |

`c2` |
a numeric vector with values of the second component. |

`c3` |
a numeric vector with values of the third component. |

`c4` |
a numeric vector with values of the fourth component. |

Most of these functions are only used internally, but sometimes it might be useful to plot “custom” ternary or quaternary graphics.

Note that, apart from `toSimplex()`

, functions do not have *any* checks, so it is advisable to use this function if elements are added to plots or own graphics are created.

The function returns a `matrix`

object with coordinates in two or three dimensions

In prior versions (up to 0.5-0), an unexported function `coord.trafo()`

was used internally and could also be accessed via `DirichletReg:::coord.trafo()`

.

If you have used this in your code, you will get a message that the function is now deprecated and will become defunct in the future.
Use `toSimplex()`

instead.

Marco J. Maier

1 2 | ```
# create a DirichletRegData object from the Arctic Lake data
"to be added"
``` |

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