FUNTA index

Internal function that is used by `FUNTA`

and `rFUNTA`

.

1 | ```
angle(cut.slope, ref.slope, tick.dist)
``` |

`cut.slope` |
The slope of function x1. |

`ref.slope` |
The slope of function x2. |

`tick.dist` |
The length of the slopes. |

The intersection angle of x1 and x2.

A. Rehage

1 | ```
angle(1,2,0.1)
``` |

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