[R] Split plot in colors/pch??

[Petr Pikal]

If I understand it correctly you want to plot variable y against 
variable x but with plotting characters or colours coded by z 
values.

I usually use this construction

plot(daf$x,daf$y,type="n")

followed by 

points(daf$x, daf$y, pch=daf$z, col=daf$z)

if z has reasonable values }integer 1:7

or construction with for loop

for (i in 1:n) points(daf$x[selection according i],, daf$y[sel......], 
pch=i, col=i)

and sometimes matplot is quite convenient (see help pages).

Meanwhile for good graphic tricks I usually consult StatsRus

http://lark.cc.ukans.edu/~pauljohn/R/statsRus.html

On 1 Mar 2002 at 11:28, Fredrik Karlsson wrote:

> Hi all
> 
> This seems like a very easy question, but I have not found a simple
> answer to it:
> 
> If you have a dataframe, how to you plot two of then in different
> colors depending on a third variable?
> 
> 
> All help appreciated!
> 
> /Fredrik
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Petr Pikal
petr.pikal at precheza.cz
p.pik at volny.cz


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