[R] Filled triangles in lattice graphics?

[M.Kondrin]

Hans Gardfjell wrote:
> Dear R users,
> 
> I can get a filled triangle pointing upwards by specifying pch=17 in 
> xyplot or lpoints, but how do I get a filled triangle that points 
> downwards?
> 
> In the standard plot function it's possible to use 
> plot(x,y,pch=25,bg="black"), but bg= doesn't seem to work with lattice 
> and lpoints.
> 
> Thanks,
> 
> Hans Gardfjell
> Ecology and Environmental Science
> Umeå University, Sweden
> 
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> 
In grid package that is underling package of lattice fill color is set 
through "gp" parameter. Try this 
plot(x,y,pch=25,gp=gpar(fill="black",col="black"))