[R] memory tricks

Steve Oncley oncley at atd.ucar.edu
Tue Mar 2 17:56:44 CET 1999

Perhaps I've missed this in the FAQ, but has someone documented any tricks
which can be used in R to optimize memory usage/execution time?  For S+,
StatSci used to recommend:
1. Avoid "for" loops whenever possible.
2. In "for" loops, have a simple expression, such as TRUE, as the last 
3. Allocate memory for a vector/array at one time, rather than building it
up in a "for" loop using c(), rbind(), etc.
4. Execute code which manipulates large objects within a function, rather
than directly from the command line.

Should these practices help when using R?  Are there others which users 
should know about?

Thanks...Steve Oncley
PO Box 3000
Boulder CO 80307-3000 USA
oncley at ucar.edu
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