[R] "Fold" in R?

[Peter Dalgaard]

Seung Jun <jun at cc.gatech.edu> writes:

> Fold in Mathematica (or reduce in Python) works as follows:
> 
> Fold[f, x, {a, b, c}] := f[f[f[x,a],b],c]
> 
> That is, f is a binary operator, x is the initial value, and the
> results are cascaded along the list.  I've found it useful for
> reducing lists when I only have a function that accepts two arguments
> (e.g., merge in R).
> 
> Is there any R equivalent?  I'm a newbie in R and having a hard time
> finding such one.  Thank you.

Tried searching the mailing list for "Fold"? It was discussed on this
very list in November.

http://cran.r-project.org/search.html
http://maths.newcastle.edu.au/~rking/R/ 

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907