[R] breaks in hist()
Prof Brian Ripley
ripley at stats.ox.ac.uk
Tue Jun 26 21:46:25 CEST 2001
On Tue, 26 Jun 2001, Maarten van Gelder wrote:
> Sorry, I forgot to mention in my earlier post that I run version 1.2.3 on
Thanks: hist has been changed several times recently.
> I was using the hist() function to create a frequency table of some network
> traffic data. The range in values is rather large, from 0 till just under
> 10e12. Calling hist(x, breaks=c(0,1000,1e6,1e9,1e12),plot=F,freq=T) causes
> hist() to return :
>  -1.0000e+05 1.0100e+05 1.1000e+06 1.0001e+09 1.0000e+12
> Is this recalculation of the breaks by hist() intended?
Yes. You have got caught by the following:
fuzz <- if (right)
c(if (include.lowest) -diddle else diddle, rep(diddle, length(breaks) - 1))
else c(rep(-diddle, length(breaks) - 1), if (include.lowest) diddle else -diddle)
breaks <- breaks + fuzz
Don't you want to use log10 scale?
Brian D. Ripley, ripley at stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272860 (secr)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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