[R] question to make a vector without loop

[Phil Spector]

Khazaei -
    I think

mapply(function(x,ind)x * a / (b + ind),c(NA,w),c(NA,1:length(w)))

does what you want, but since you didn't include a reproducible
example, I can't tell for sure.

 					- Phil Spector
 					 Statistical Computing Facility
 					 Department of Statistics
 					 UC Berkeley
 					 spector at stat.berkeley.edu


On Fri, 26 Feb 2010, 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?
>
> Regards
>
> khazaei
>
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