[Rd] hasNA() / anyNA()?
Prof Brian Ripley
ripley at stats.ox.ac.uk
Tue Aug 14 15:21:13 CEST 2007
On Tue, 14 Aug 2007, Benjamin Tyner wrote:
> Why not
> hasNA <- function(x) !is.na(match(NA, x))
It hashes the whole table (here x) and so is both slower and uses more
memory than is.na(x).
I am not clear what is meant by 'efficiency' here, or why it is needed (we
have not been told). But writing a C-level function to do this would have
taken less time that this discussion has already taken ....
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
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