[R] prblem with NA

[Prof Brian Ripley]

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)
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