[R] Problems with graphics

[Petr Pikal]

Hi

Well, you did not specified what you have tried to do and how did you 
fail but

On 2 Oct 2006 at 16:41, Christophe Nguyen wrote:

Date sent:      	Mon, 02 Oct 2006 16:41:29 +0200
From:           	Christophe Nguyen <Christophe.Nguyen at bordeaux.inra.fr>
To:             	r-help at stat.math.ethz.ch
Subject:        	[R] Problems with graphics

> Dear all,
> I am a SAS user, who's trying R. I am a little bit lost for graphics.
> What is the simplest way for plotting y as a function of x with one
> symbol (line or dot) for each level of a class variable z (for SAS

If z is factor
plot(x,y pch=as.numeric(z), ...)

otherwise you need to change it to one.

BTW, you can use the similar approach with lines and points - col, 
lwd, cex,... and othe parameters.


> langage= plot x*y=z). Can I add vertical bars for standard deviation

there are various options, one is to use arrows with angle=90.

arrows(x,y,x, y+ystd, angle=90)

> stored in a  separate variable (say  ystd). Finally, is it possible to
> do all this with xyplot function arranging plots according to A and B
> factor: xyplot(y~x|A*B) with as many plots and symbol as there is

that is completely different story and you probably need to elaborate 
your own panel.function.

HTH
Petr

> levels in the z variable for each panel? Thanks for the help. Chris
> 
> -- 
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Petr Pikal
petr.pikal at precheza.cz