[Rd] Modified Histogram functions
Martin Maechler <email@example.com>
Mon, 10 Jul 2000 10:43:10 +0200 (CEST)
>>>>> "Kjetil" == Kjetil Kjernsmo <firstname.lastname@example.org> writes:
Kjetil> Dear all, I have done further modifications on the histogram
Kjetil> functions that I reported earlier this year, and I hope this
Kjetil> can be of use and perhaps included in the distribution. I have
Kjetil> been using this stuff a couple of months myself, and while it
Kjetil> is nothing sophisticated, it has it's applications. :-) I did a
Kjetil> few small modifications today to make it a bit more compact.
Kjetil> I have modified the hist.default() function so that the list it
Kjetil> returns has class "histogram". I have put the plotting in a
Kjetil> separate function, plot.histogram(), which is called from
Kjetil> hist.default if plot=T, and I have made a lines.histogram()
Kjetil> (calling it "lines", is that a wise choice? It seemed most
Kjetil> natural, but then again....), which can be used to overlay
Kjetil> histograms on existing histograms. Here it is obviously a lot
Kjetil> of room for improvement. E.g. calling plot.histogram() with
Kjetil> multiple histogram objects could produce a plot where coloumns
Kjetil> representing the same values are grouped, I haven't addressed
Kjetil> that. The code is below my .sig.
Your main idea is great and something we (people here)
have been considering to do as well.
I'd definitely want to put something along these lines into base R.
Please, "everyone chime in!"
Kjetil> As you can see, there are few changes from your code. The
Kjetil> biggest change is that hist.default() calls plot.histogram()
Kjetil> (or rather plot()). Also note that the warning about wrong
Kjetil> areas only appears in hist.default(). I figured that the user
Kjetil> is most likely created the histogram object with hist, so s/he
Kjetil> might no want to be bothered with this warning again. I don't
Kjetil> know if this is wise, s/he might just have forgotten or
Kjetil> something. :-)
Kjetil> I guess plot.histogram() may also be made more compact by
Kjetil> calling lines.histogram() to plot the actual rects, but I
Kjetil> didn't find a practical way of doing this, so I didn't... :-)
Kjetil> And, contrary to the other functions making histogram plots,
Kjetil> lines.histogram() does take lty as an argument (useful for
Kjetil> making dotted borders, to separate one histogram from another,
Kjetil> particulary useful when using colors).
Kjetil> I've got a function for adding two similar histograms as well,
Kjetil> but that's so hacked up I guess it isn't worth much.
Kjetil> BTW, I found a typo in the help for rect: xpd: logical
Kjetil> (``expand''); if `FLASE', everything is clipped to the plot
Kjetil> Hope this is useful for someone... :-)
certainly, thanks a lot!
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