On Sun, 30 Jan 2000, Paul Schwarz wrote:
>
> Hi S-news readers,
>
> I've been trying to use the round() function along the key() function to
> display regression coefficients in the legend for a plot. I'd like to
> make sure that all the numbers are formatted to 3 decimal places so that
> the numbers all line up in the legend columns. Unfortunately, the
> round() function does not do what I thought it would do (or at least not
> what I'd like it to do). For example:
>
> > round(2,3)
> [1] 2 # what I'd like is 2.000
> > round(2.0202,3)
> [1] 2.02 # what I'd like printed is 2.020
Careful. Round does do what one would expect: it is the printing that is
supressing the trailing zeroes. key() needs a character string, and will
use as.character (which can be different again).
> I've also tried usin the format() function -- also without success. How
> do I force the S-PLUS to print the numbers with the 3 decimal places
> (including a trailing zero if need be) so that my number will line up in
> my legend?
Use nsmall in format as in
> format(round(2, 3), nsmall=3)
[1] "2.000"
> format(round(2.02, 3), nsmall=3)
[1] "2.020"
--
Brian D. Ripley, ripley@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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