On Tue, 2 Dec 2008, hadley wickham wrote:
The underlying issue is actually not in transform() but in data.frame():
aq <- airquality[sample(1:153,6),]
data.frame(aq, list(a=1,b=2))
Error in data.frame(aq, list(a = 1, b = 2)) :
arguments imply differing number of rows: 6, 1
data.frame(aq, list(a=1))
Ozone Solar.R Wind Temp Month Day a
3 12 149 12.6 74 5 3 1
31 37 279 7.4 76 5 31 1
34 NA 242 16.1 67 6 3 1
65 NA 101 10.9 84 7 4 1
59 NA 98 11.5 80 6 28 1
133 24 259 9.7 73 9 10 1
Is this a bug or a "feature"?
As documented:
Objects passed to data.frame should have the same number of rows, but
atomic vectors, factors and character vectors protected by I will be
recycled a whole number of times if necessary.
How did you manage to miss that in the help page?
Hadley
--
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Brian D. Ripley, [EMAIL PROTECTED]
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
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Oxford OX1 3TG, UK Fax: +44 1865 272595
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