[R] applying a function over an array

McGehee, Robert Robert.McGehee at geodecapital.com
Wed May 18 15:21:17 CEST 2005

This will do it.

> a <- array(1:12, c(4, 3))
> d <- function(a,b,c) {a+b+c}
> apply(a, 1, function(x) do.call("d", sapply(x, list)))
[1] 15 18 21 24

-----Original Message-----
From: BJ [mailto:erithid at bellsouth.net] 
Sent: Wednesday, May 18, 2005 9:10 AM
To: r-help at stat.math.ethz.ch
Subject: [R] applying a function over an array

Is there a way to apply a function with several arguements over an 
array? For instance if you had a function d<-function(a,b,c) {a+b+c} and

a 4,3 array, could you apply the function over each line of the array? 
tapply seems to only allow one argument, and I just can't think of a way

to explicitly tell R that I am passing it 3 distinct objects instead of 
1 complex one.  Thank you as always for your help. ~Erithid

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