On Wed, 11 Jul 2007, Herve Pages wrote: > Hi, > > I'm wondering why indexing a data frame by row name doesn't work > with [[. It works with [: > > > sw <- swiss[1:5,1:2] > > sw["Moutier", "Agriculture"] > [1] 36.5 > > but not with [[: > > > sw[["Moutier", "Agriculture"]] > Error in .subset2(.subset2(x, ..2), ..1) : subscript out of bounds > > The problem is really with the row name (and not the col name) since > this works: > > > sw[[4, "Agriculture"]] > [1] 36.5 > > but not this: > > > sw[["Moutier", 2]] > Error in .subset2(.subset2(x, ..2), ..1) : subscript out of bounds
.subset2 drops all attributes, including names. > .subset2(sw, "Agriculture") [1] 17.0 45.1 39.7 36.5 43.5 This is nothing new: R 2.0.0 did the same, for example. > No such problems with a matrix where everything works as expected: > > > msw <- as.matrix(sw) > > msw[["Moutier", "Agriculture"]] > [1] 36.5 > > Thanks! > > H. -- 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 ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
