# data.frame does not recycle consistently (PR#1713)

**ripley@stats.ox.ac.uk
**
ripley@stats.ox.ac.uk

*Thu, 27 Jun 2002 17:52:42 +0100 (BST)*

On Thu, 27 Jun 2002 Kevin.Wright@pioneer.com wrote:
>* Full_Name: Kevin Wright
*>* Version: 1.5.1
*>* OS: Windows 95
*>* Submission from: (NULL) (170.54.59.160)
*>*
*>*
*>*
*>* Note that the examples below do work in S (S-Plus 2000).
*>*
*>* It appears that data.frame does not recycle text strings. Maybe has something
*>* to do with coercion to factors???
*
Yes, it is. Not sure why that makes it inconsistent, though.
Vectors are recycled, other objects are not, and that is determined after
conversion to a column of a data frame. We could fairly easily allow
factors and simple "AsIs" objects to be recycled.
BTW, S-PLUS 2000 is not S, and its data frame code is quite a lot
different from the original S code. It also makes mistakes: compare
>* data.frame(x=c("A","B"),y=I("C"))
*>* data.frame(x=c("A","B"),y=I(rep("C", 2)))
*
>*
*>* > data.frame(x=1:2,y=1)
*>* x y
*>* 1 1 1
*>* 2 2 1
*>*
*>* > data.frame(x=c("A","B"),y=T)
*>* x y
*>* 1 A TRUE
*>* 2 B TRUE
*>*
*>* > data.frame(x=c("A","B"),y="C")
*>* Error in data.frame(x = c("A", "B"), y = "C") :
*>* arguments imply differing number of rows: 2, 1
*>*
*>*
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--
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)
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