missing warnings...
Martin Maechler
Martin Maechler <maechler@stat.math.ethz.ch>
Thu, 13 Jan 2000 18:36:28 +0100 (MET)
>>>>> "PD" == Peter Dalgaard BSA <p.dalgaard@biostat.ku.dk> writes:
<....>
PD> Boxplot expects a *factor* as the grouping criterion. The x axis
PD> labels are the group names, not x coordinates (i.e. it might as well
PD> be "married, unmarried, divorced" as "0, 1, 2."), and since factors
PD> are internally coded as 1:nlevels, that's the value used for the
PD> actual coordinate system.
PD> Passing a numeric vector gets it converted to a factor before use, so
PD> things are as you should expect. Except possibly for two issues:
PD> a) should one really do the numeric->factor conversion without a
PD> warning message?
Yes, we should have that warning (and more!):
Warning messages that I am extremely missing are in the following two examples
plot(1); points(2,2)
plot(1); text(2,2,"bla")
(and similar with lines and all kinds of plots).
We *definitely* should warn the user that (s)he is drawing outside the plot
region.
We need "graphical warnings"
(which can be turned off via an options() or par() call).
PD> b) perhaps boxplot could use an at= argument saying "plot boxes here"
PD> since the current version wouldn't be able to deal with
PD> non-equidistant groups.
oh yes!
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