[R] plot and subsets

[Erich Neuwirth]

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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