[R] angles

[Greg Snow]

Look at the my.symbols function in the TeachingDemos package.  You can get line segments using the ms.arrows function and setting the length argument to 0 (or you can make your own plotting function by copying ms.arrows and replacing the call to arrows with a call to segments).


Hope this helps,

-- 
Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.snow at imail.org
801.408.8111


> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of Tom_R
> Sent: Friday, April 02, 2010 10:13 AM
> To: r-help at r-project.org
> Subject: [R] angles
> 
> 
> Hi R users,
> 
> I would like to construct a sort hybrid vector/scatter plot.
> 
> My data is in the following format:  3-column x,y,z data-frame in which
> every row is a separate data-point.
> The x & y columns are coordinates, and the z column contains
> orientation
> data (range 0-180 degrees, with East=0 & North=90).
> 
> I need to set each x,y, point to have the alignment in z. Hence my
> 'vectors'
> would simply be lines with the mid-point at x,y and without arrow-
> heads.
> 
> R's normal vector plot requires a pair of x,y coords for the start &
> end of
> each vector, whereas I just have an orientation.
> 
> Any ideas?
> 
> Cheers!
> Tom
> 
> --
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