[R] re| `By reference'

[Steve Wisdom]

David Brahm <brahm at alum.mit.edu> wrote: 

>VBMorozov at lbl.gov wrote:

>> I would like to pass variables to a function in R in "by reference"...

>Just in case the ensuing discussion got too esoteric, here's one simple
answer:

>R> x <- 1:10
>R> MyFunc <- function(x, zz) assign(deparse(substitute(zz)), sum(x), 1)
>R> MyFunc(x,y)
>R> y
>   [1] 55

Still less esoteric is 

> MyFunc <- function(x,zz) zz <<- sum(x)
> MyFunc(1:10,y)
> y
[1] 55

Although I don't know if this is a good general solution to `passing by
reference' 

(BTW it behaves differently in S+ 

> MyFunc <- function(x,zz) zz <<- sum(x)
> MyFunc(1:10,y)
[1] 55
> y
 [1]  1  2  3  4  5  6  7  8  9 10

)



-- 

Steve Wisdom
http://208.202.87.68/subsidiaries/subsdeep.asp


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