[R] Rotation of parallel lines

[David Winsemius]

On Nov 18, 2013, at 7:27 AM, Tonio wrote:

>
>
> Dear list,
>
> Consider these two parallel segments in a plot.
>
> plot(c(1, 6), c(2, 2), type="n", xlim=c(0, 7), ylim=c(-2, 6))
> segments(1, 1, 6, 1)
> segments(1, 3, 6, 3)
>
>
>
> How can I rotate the two lines together by a defined angle?

Base graphics do not support object operations. You need to do the  
calculation and redraw the plot.

Either lattice or ggplot2 which depend upon the "grid" system would  
have the possibility to "rotate" a component.

-- 

David Winsemius, MD
Alameda, CA, USA