On Sat, 3 Nov 2007, Duncan Murdoch wrote:
On 03/11/2007 4:34 PM, Ulrike Grömping wrote:
Dear all,
I got stuck with a weird behavior of pretty:
pretty(c(-1,1),n=1)
yields -2, 0, 2 instead of the desired result -1 1.
Likewise,
pretty(c(-2,2),n=1)
yields -5, 0, 5 instead of the desired result -2 2.
I don't think pretty() should ever return -1 1 or -2 2. It should
always return multiples of some round number, so it would have to
include 0. But I don't see why it is expanding the range. It doesn't
do that when the results are non-negative, e.g.
> pretty(0:1, n=1)
[1] 0 1
> pretty(0:2, n=1)
[1] 0 2
With n=0, the result is the same, while with n=2 everything is as
documented.
This behavior nastily messed up some of my cube plots. Is there any chance
that this can be fixed?
The documentation has been sitting for 8 years with "FIXME" notes in it,
so I wouldn't hold my breath.
The way to make the 'chance' appreciable would be to contribute a
(high-quality) patch.
--
Brian D. Ripley, [EMAIL PROTECTED]
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 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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