[R] question to make a vector without loop

[Uwe Ligges]

On 26.02.2010 16:23, khazaei at ceremade.dauphine.fr wrote:
> Hello all,
>
> I want to define a vector like w[k+1]=w[k]*a/(b+k) for k=1,...,N-1 without
> use loop. Is it posible to do in R?

Sure:


wMake <- function(w, a, b, n){
	w * (a^(0:(n-1))) / cumprod(c(1, (b+1):(b+n-1)))
}

wMake(w=1, a=2, b=3, n=10)

Uwe Ligges



>
> Regards
>
> khazaei
>
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