From ripley@stats.ox.ac.uk  Wed May  8 19:05:24 2002
From: ripley@stats.ox.ac.uk (ripley@stats.ox.ac.uk)
Date: Wed, 8 May 2002 20:05:24 +0200 (MET DST)
Subject: [Rd] [.data.frame handles drop inconsistently (PR#1530)
Message-ID: <200205081805.UAA20673@pubhealth.ku.dk>

R 1.5.0:

d.df <- data.frame(x = 1:3, y = c("A","D","E"), z = c(6,9,10))
d.df[1,1:3]
xx <- d.df[1,]
xx[, 1:3]

d.df[1,1:3] and xx[, 1:3] should be the same, and they are in S.

d.df[1,1:3] is a data frame.

xx[, 1:3] is a list, and it should not be.
xx[, 1:3, drop=FALSE]  is the desired answer.

(This cropped up when looking at merge, which was caught by it.)

-- 
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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[Rd] [.data.frame handles drop inconsistently (PR#1530)
ripley@stats.ox.ac.uk