[R] Transforming matrix

[Prof Brian Ripley]

On Thu, 10 Apr 2003, Ramon Diaz wrote:

> If you have your TRUE/FALSE values in m1, then do
> 
> > mode(m1) <- "numeric".
> 
> This is probably not the best way but it seems to work.

That maps TRUE to 1 and FALSE to 0, and I read the request as for the 
reverse.

ifelse(m1, 0, 1) is probably the most transparent way.


> On Thursday 10 April 2003 15:56, Ramzi Feghali wrote:
> > hi everybody,
> > anyone knows how we can transform a binary matrix with TRUE and FALSE to 0
> > and 1 without looping? Thx

-- 
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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