[R] plot and subsets

[Ben Bolker]

 e.g.: to plot with colors 1 and 2 (easiest) and plotting characters 1 and
16:

x <- runif(10)
y <- runif(10)
z <- factor(sample(1:2,size=10,replace=TRUE))
plot(x,y,col=as.numeric(z),pch=c(1,16)[as.numeric(z)])



On Tue, 27 Nov 2001, Erich Neuwirth wrote:

> when i need to plot the same variables
> (size and weight e.g.)
> for different groups (male and female)
> in one scatterplot,
> i seem have to use plot() for the first group and
> points() for the second group.
>
> is there a plotting function somewhere which would use a factor variable
> automatically to represent the different groups
> by different symbols and/or colors.
>
> i know it is not too difficult
> to write such a function for oneself,
> the question is if this should be part of a standard toolkit already.
>
> or am i just plainly overlooking something which is already there.
>
>
> by(data,factor,plot)
>
> could be a "role model".
> and this seems not to work.
>
>
>
>
> --
> Erich Neuwirth, Computer Supported Didactics Working Group
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-- 
318 Carr Hall                                bolker at zoo.ufl.edu
Zoology Department, University of Florida    http://www.zoo.ufl.edu/bolker
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