# corner

##### Draw a corner showing the angle between two vectors

A utility function for drawing vector diagrams. Draws two line segments to indicate the angle between two vectors, typically used for indicating orthogonal vectors are at right angles in 2D and 3D diagrams.

##### Usage

`corner(p1, p2, p3, d = 0.1, absolute = TRUE, ...)`

##### Arguments

- p1
Starting point of first vector

- p2
End point of first vector, and also start of second vector

- p3
End point of second vector

- d
The distance from

`p2`

along each vector for drawing their corner- absolute
logical; if

`TRUE`

,`d`

is taken as an absolute distance along the vectors; otherwise it is calculated as a relative distance, i.e., a fraction of the length of the vectors. See`pointOnLine`

for the precise definition.- ...
Arguments passed to

`link[graphics]{lines}`

or to`link[rgl]{lines3d}`

##### Details

In this implementation, the two vectors are specified by three points, `p1`

, `p2`

, `p3`

, meaning
a line from `p1`

to `p2`

, and another line from `p2`

to `p3`

.

##### Value

none

##### See Also

Other vector diagrams: `Proj`

,
`arc`

, `arrows3d`

,
`circle3d`

, `plot.regvec3d`

,
`pointOnLine`

, `regvec3d`

,
`vectors3d`

, `vectors`

##### Examples

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

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