Plot the scaling coordinates of the proximity matrix from RRF.

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`rf` |
an object of class |

`fac` |
a factor that was used as response to train |

`k` |
number of dimensions for the scaling coordinates. |

`palette` |
colors to use to distinguish the classes; length must be the equal to the number of levels. |

`pch` |
plotting symbols to use. |

`...` |
other graphical parameters. |

The output of `cmdscale`

on 1 - `rf$proximity`

is
returned invisibly.

If `k > 2`

, `pairs`

is used to produce the
scatterplot matrix of the coordinates.

Robert Gentleman, with slight modifications by Andy Liaw

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