[R] [SPAM] - Reducing a list of functions by composition fails - Bayesian Filter detected spam

[David Reiner]

> Funcall <- function(f, ...) f(...)
> Reduce(Funcall,list(plus2,plus3,plus4),init=3,right=TRUE)
[1] 12

Basically from the examples from ?Reduce.
HTH,
David L. Reiner
XR Trading LLC

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of Mog
Sent: Thursday, August 05, 2010 3:32 PM
To: r-help at r-project.org
Subject: [SPAM] - [R] Reducing a list of functions by composition fails - Bayesian Filter detected spam

Hi All,

I'd like to be able to specify the ordered composition of several
functions. So I defined compose:

compose <- function(f,g){
  function(x){f(g(x))}
}

and some simple test functions:

plus2 <- function(x){x+2}
plus3 <- function(x){x+3}
plus4 <- function(x){x+4}

>  (compose(plus2,compose(plus3,plus4)))(3)
[1] 12

Works fine. But trying to reduce a list of functions by compose fails:

> Reduce(compose,list(plus2,plus3,plus4),right=TRUE)(3)
Error: evaluation nested too deeply: infinite recursion / options(expressions=)?

As far as I can tell, that reduction should be the same as my call
above. What am I doing wrong?

Thanks very much!

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