[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
> NT4.0

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 :
> $breaks
> [1] -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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