Description Usage Arguments Details Value Author(s) See Also Examples

connects two sets of points with a dendrogram-like structure,

adds an arrowhead at a certain distance.

1 2 |

`from ` |
matrix of coordinates (x,y) of points *from* which to draw arrow. |

`to ` |
matrix of coordinates (x,y) of points *to* which to draw arrow. |

`lwd ` |
line width. |

`lty ` |
line type. |

`lcol ` |
line color. |

`arr.col ` |
arrow color. |

`arr.side ` |
segment number on which arrowhead is drawn (1,2). |

`arr.pos ` |
relative position of arrowhead on segment on which arrowhead is drawn. |

`line.pos ` |
relative position of (horizontal/vertical) line. |

`path ` |
Vertical, Horizontal. |

`... ` |
other arguments passed to function straightarrow. |

a tree-shaped arrow is drawn between points '(`from`

, `to`

)',
where both `from`

and `to`

can be several points.

How the segments are drawn is set with `path`

which can take on the
values:

"H": (horizontal): first left or right.

"V": (vertical): first down- or upward.

The segment(s) on which the arrow head is drawn is set with `arr.side`

,
which is one or more values in (1, 2)

The position of the arrowhead on the segment on which it is drawn,
is set with `arr.pos`

, a value between 0(start of segment) and
1(end of segment)

The type of the arrowhead is set with `arr.type`

which can take the
values:

"simple" : uses comparable

**R**function arrows."triangle": uses filled triangle.

"curved" : draws arrowhead with curved edges.

"circle" : draws circular head.

"ellipse" : draws ellepsoid head

"T" : draws T-shaped (blunt) head

see `Arrowhead`

from package `shape`

for details
on arrow head.

coordinates (x,y) where arrowhead is drawn

Karline Soetaert <[email protected]>

`straightarrow`

, `segmentarrow`

,
`curvedarrow`

, `selfarrow`

,
`bentarrow`

, `splitarrow`

,

`arrows`

: the comparable R function,

`Arrows`

: more complicated arrow function from package
shape.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | ```
openplotmat(main = "treearrow")
pos <- coordinates(c(3, 2, 4, 1))
treearrow(from = pos[1:5, ], to = pos[6:10, ])
for (i in 1:10)
textrect(pos[i, ], lab = i, cex = 2, radx = 0.05)
openplotmat(main = "treearrow")
pos <- coordinates(c(2, 4), hor = FALSE)
treearrow(from = pos[1:2, ], to = pos[3:6, ],
arr.side = 1:2, path = "V")
for (i in 1:6)
textrect(pos[i, ], lab = i, cex = 2, radx = 0.05)
openplotmat(main = "treearrow")
pos <- coordinates(c(3, 5, 7, 7, 5, 3))
treearrow(from = pos[1:15, ], to = pos[15:30, ], arr.side = 0)
for (i in 1:30)
textrect(pos[i, ], lab = i, cex = 1.2, radx = 0.025)
``` |

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