Re: [R] Plot lines whose angle and length depict vector quantities

arameter to decide if the arrows should be centered on > the point, start at the point, or end at the point. > > The ms.arrows function was designed for exactly what you describe. > > > On Fri, Sep 27, 2013 at 12:56 PM, Conor Ryan wrote: > >> I am trying to plot p

Re: [R] Plot lines whose angle and length depict vector quantities

Certainly not a homework question. Elementary questions do not necessarily indicate that one is a student! Always learning... Dr Conor Ryan On 28 September 2013 11:39, Patrick Burns wrote: > On 27/09/2013 21:01, Bert Gunter wrote: > >> On Fri, Sep 27, 2013 at 12:44 PM, Sarah Gosl

Re: [R] Plot lines whose angle and length depict vector quantities

Hi Jim, vectorField worked a treat - thanks! On 28 September 2013 01:57, Jim Lemon wrote: > On 09/28/2013 04:56 AM, Conor Ryan wrote: > >> I am trying to plot points on a map for each ship locations (lat/long), >> where >> each point is a line whose angle (degrees) d

[R] Plot lines whose angle and length depict vector quantities

I am trying to plot points on a map for each ship locations (lat/long), where each point is a line whose angle (degrees) denotes ships heading and whose line length denotes it's speed. Unfortunately arrows(); p.arrows (sfsmisc) and ms.arrows (TeachingDemos) require start and end coordinates but I o