[R]:?alternative to loop

[Mai Zhou]

Many people suggested apply(). It works for many functions.
But if you just need sum(), take a look at rowsum(), it should be 
faster.

Note also, the function rowsum() in Splus2000 is not as fast as in R.

Mai Zhou
> 
> Hello to all R people,
> 
> for the application of a function to each column of a matrix (ex:
> function sum()), i'd like to know if there is a simpler (and faster)
> alternative to a loop like :
> 
> for (i in 1: ncol(m)){sum(m[i])}
> 
> Thanks in advance,
> Cordialement,
> --
> Nicolas Baurin
> 
> Doctorant
> Institut de Chimie Organique et Analytique, UPRES-A 6005
> Université d'Orléans, BP 6759
> 45067 ORLEANS Cedex 2, France
> Tel: (33+) 2 38 49 45 77
> 
> 
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