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One disadvantage of using R and S-Plus is that these languages are
a bit slow. There is probably not much to be gained by rewriting things
in an other language, however, since most of the computer
time, in any case, will be consumed in matrix manipulations,
which, in S-Plus (and I think in R too), are carried out
internally with efficient code from the LINPACK library.
Jarle Tufto
2001-08-28