prblem with NA
On Tue, 6 Jan 2009, Petr PIKAL wrote:
[...]
Logical vectors can be treated like numeric with TRUE=1 and FALSE=0,
More accurately, 'like integer' ('numeric' often means 'double').
I learned that somewhere but it is not mentioned in help page for ?logical so it is not so easy to find.
Hmm: it *is* in 'An Introduction to R'.
Brian D. Ripley, ripley at 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 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595