[R-sig-eco] Directional data in time series

[g.cerritelli]

Dear R list,

I have data on the heading kept by an animal during a migratory 
movement. I would like to represet this data not using a circular plot 
but on a xy-plot, to represent the change of kept directions over time. 
I have tried already to do this, but because the animal keeps always a 
direction between 30° and 250°, the final plot is not easily readable 
(the northern directions represented by 0° and 360° are represented at 
the opposite sides of the axis). Do you have any ideas on how to set the 
order of a continuos variable (from 0 to 360)in a different way for the 
axis of a plot? For example I would like to have an y-axis starting at 
180° and ending at 179°, with 360° next to 0° (so to have values 
indicating the North all in the same area of the axis). Thank you in 
advance for any suggestion

Kind regars,
Giulia