[R] lapply() reccursively
Charles C. Berry
cberry at tajo.ucsd.edu
Tue Oct 13 18:42:03 CEST 2009
On Tue, 13 Oct 2009, Kaveh Vakili wrote:
> Hi all,
> I was wondering whether it is possible to use the lapply() function
> to alter the value of the input, something in the spirit of :
> Something akin to a for() loop, but using the lapply() infrastructure.
> I haven't been able to get rapply() to do this.
Maybe you want to check out
For the example above, something like
a3 <- Reduce( "*", a1, accumulate = TRUE )
> The reason is that the "real" a2 function is a difficult function that only needs to be evaluated if the value of a1[i-1] meets some criteria.
> Thanks in advance,
> R-help at r-project.org mailing list
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
Charles C. Berry (858) 534-2098
Dept of Family/Preventive Medicine
E mailto:cberry at tajo.ucsd.edu UC San Diego
http://famprevmed.ucsd.edu/faculty/cberry/ La Jolla, San Diego 92093-0901
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