[R] plot and subsets
Martin Maechler
maechler at stat.math.ethz.ch
Tue Nov 27 19:17:12 CET 2001
>>>>> "Erich" == Erich Neuwirth <erich.neuwirth at univie.ac.at> writes:
Erich> when i need to plot the same variables (size and
Erich> weight e.g.) for different groups (male and female)
Erich> in one scatterplot, i seem have to use plot() for the
Erich> first group and points() for the second group.
Erich> is there a plotting function somewhere which would
Erich> use a factor variable automatically to represent the
Erich> different groups by different symbols and/or colors.
Erich> i know it is not too difficult to write such a
Erich> function for oneself, the question is if this should
Erich> be part of a standard toolkit already.
Erich> or am i just plainly overlooking something which is
Erich> already there.
yes, indeed you are :
plot() itself
Erich> by(data,factor,plot)
Erich> could be a "role model". and this seems not to work.
Something like
plot( <data>, pch = as.integer(factor),
col = as.integer(factor))
{which I think does not work in S-plus}
BTW:
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Martin Maechler <maechler at stat.math.ethz.ch> http://stat.ethz.ch/~maechler/
Seminar fuer Statistik, ETH-Zentrum LEO D10 Leonhardstr. 27
ETH (Federal Inst. Technology) 8092 Zurich SWITZERLAND
phone: x-41-1-632-3408 fax: ...-1228 <><
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