On Fri, Sep 27, 2013 at 12:44 PM, Sarah Goslee <sarah.gos...@gmail.com> wrote: > It's a straightforward trigonometry problem, isn't it?
Indeed! ( (r,theta) to (x,y) coordinates ) . So I wonder if this is a homework problem. If so, the OP should note that we try not to do homework here. Cheers, Bert > > On Fri, Sep 27, 2013 at 2:56 PM, Conor Ryan <miol...@gmail.com> 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) 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 only >> have a single coordinate and an angle to work with. Can you suggest any >> other packages or commands that might allow me to plot this? Alternatively, >> can anyone suggest a method of making 'angle' a vector quantity when using >> the arrows function? Any advice would be much appreciated! >> > > -- > Sarah Goslee > http://www.functionaldiversity.org > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. -- Bert Gunter Genentech Nonclinical Biostatistics Internal Contact Info: Phone: 467-7374 Website: http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.