[R] out of memory?

[Prof Brian D Ripley]

On Thu, 22 Mar 2001 news_vkhamenya at chat.ru wrote:

> Hello r-help,
>
> why call:
>
> #----------
> outer(1:1000, 1:2, function(r,c) ifelse(m[r,c]<=0,.0001,m[r,c]) )
> #----------
>
> for matrix m with only 1000 rows and 2 columns forces my PC to use
> more than 250Mb(!) of virtual memory?  strange...

Um, a strange use of outer. Try

m[m <= 0] <- 0.0001

for an efficient solution.

-- 
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 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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