[R] Histogram for factors

Thomas Vogels tov at ece.cmu.edu
Tue Jan 16 07:47:43 CET 2001

Robert Gentleman <rgentlem at jimmy.harvard.edu> writes:

> On Sat, Jan 13, 2001 at 10:31:16AM +0100, Martin Maechler wrote:
> > >>>>> "PD" == Peter Dalgaard BSA <p.dalgaard at biostat.ku.dk> writes:
> > 
> > Well,
> > 	plot(f) 
> > already draws a barplot of a factor f (by the  plot.factor method).
>   Which many of us would think of as being the right "default" plot
> for a factor. However, I also think that the right thing for histogram
> to do is to inform you that this is not a continuous variable.
> I don't think of a barplot (barchart) as a specialized histogram.

thanks for the responses.  Yepp, I fell into the trap of trying to use
histogram for a definitely not continuous variable.  I'll go back to
reading a couple of my intro books...

Now the (actually not so) funny thing is that the labels for the
x-axis disappear when I specify colors for the bars.  (R 1.2.1, Linux)
Ok, maybe the other thing I'll have to catch up on is the docu...

  x <- cut (rnorm (10), 3)
  plot (x)  # has x axis (i.e. cut ranges in this silly example)
  plot (x, col="green")  # no x axis.  Dto. for col=c("green", "red") etc.


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