[R] triangles point left, filled?

[David Winsemius]

On Nov 1, 2011, at 5:05 AM, Martin Ivanov wrote:

> Dear R users,
>
> I want to plot not only triangles point up and triangles point down,
> which is easy using the "pch" argument to "points". I want to plot  
> left and right pointing triangles as well. They must be fillable  
> with colour.
>
> I browsed a little in the documentation, tried rotating the up and  
> down pointing triangles, but of no avail. Any suggestions will be  
> appreciated.

 > plot(1:10)
 > polygon(x=c(1.5,1.6,1.6), y=c(1.5,1.6,1.4))
 > polygon(x=c(1.5,1.4,1.4)+1, y=c(1.5,1.6,1.4)+1)
 > polygon(x=c(1.5,1.7,1.7)+1, y=c(1.5,1.7,1.3)+2, col="red")

>
> Regards,
> Martin Ivanov
>
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David Winsemius, MD
Heritage Laboratories
West Hartford, CT