# arrows3d

##### Draw 3D arrows

Draws nice 3D arrows with `cone3d`

s at their tips.

##### Usage

```
arrows3d(coords, headlength = 0.035, head = "end", scale = NULL,
radius = NULL, ref.length = NULL, draw = TRUE, ...)
```

##### Arguments

- coords
A 2n x 3 matrix giving the start and end (x,y,z) coordinates of n arrows, in pairs. The first vector in each pair is taken as the starting coordinates of the arrow, the second as the end coordinates.

- headlength
Length of the arrow heads, in device units

- head
Position of the arrow head. Only

`head="end"`

is presently implemented.- scale
Scale factor for base and tip of arrow head, a vector of length 3, giving relative scale factors for X, Y, Z

- radius
radius of the base of the arrow head

- ref.length
length of vector to be used to scale all of the arrow heads (permits drawing arrow heads of the same size as in a previous call); if

`NULL`

, arrows are scaled relative to the longest vector- draw
if

`TRUE`

(the default) draw the arrow(s)- ...
rgl arguments passed down to

`segments3d`

and`cone3d`

, for example,`col`

and`lwd`

##### Details

This function is meant to be analogous to `arrows`

, but for 3D plots using `rgl`

.
`headlength`

, `scale`

and `radius`

set the length, scale factor and base radius of the arrow head, a
3D cone. The units of these are all in terms of the ranges of the current rgl 3D scene.

##### Value

invisibly returns the length of the vector used to scale the arrow heads

##### See Also

Other vector diagrams: `Proj`

,
`arc`

, `circle3d`

,
`corner`

, `plot.regvec3d`

,
`pointOnLine`

, `regvec3d`

,
`vectors3d`

, `vectors`

##### Examples

```
# NOT RUN {
#none yet
# }
```

*Documentation reproduced from package matlib, version 0.9.2, License: GPL (>= 2)*