drawing arrows

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Hi,

I would like to draw arrows in a classic 2D plot. Which package should I
use? is there R base functions that do job?

On google, I could not find any useful discussion about this topic, except a
link to the function 'grid.arrows' of the grid package.

My problem is I would like to draw arrows at the edge of circles drawn by
the 'symbols' function. Maybe there is already a dedicated function for
this?

Any help is appreciated.
See ?arrows.

Duncan Murdoch
Duncan mentioned the arrows function, which may do everything you want.  But, also look at the my.symbols function in the TeachingDemos package for another way to draw arrows, or to draw your circles and arrows in 1 step.
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 christophe dutang
> Sent: Friday, May 15, 2009 10:44 AM
> To: r-help at r-project.org
> Subject: [R] drawing arrows
> 
> Hi,
> 
> I would like to draw arrows in a classic 2D plot. Which package should
> I
> use? is there R base functions that do job?
> 
> On google, I could not find any useful discussion about this topic,
> except a
> link to the function 'grid.arrows' of the grid package.
> 
> My problem is I would like to draw arrows at the edge of circles drawn
> by
> the 'symbols' function. Maybe there is already a dedicated function for
> this?
> 
> Any help is appreciated.
> 
> Christophe
> 
> 
> 
> --
> Christophe DUTANG
> Ph. D. student at ISFA
> 
> 	[[alternative HTML version deleted]]
> 
> ______________________________________________
> R-help at 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.
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Hi,

I would like to draw arrows in a classic 2D plot. Which package should I
use? is there R base functions that do job?

On google, I could not find any useful discussion about this topic, except a
link to the function 'grid.arrows' of the grid package.

My problem is I would like to draw arrows at the edge of circles drawn by
the 'symbols' function. Maybe there is already a dedicated function for
this?

Any help is appreciated.

Christophe

Hi Christophe,
If you are trying to do what I think you are trying to do, consider 
drawing the arrow first, with the starting point at the center of the 
circle, then draw the circle with a fill color the same as the 
background. This should give you a circle with a nice radial arrow 
emerging from the edge.

Jim