[R] Simple Function

[Michael Bedward]

If you want to assign to a variable in your workspace, rather than a
local variable in your function, you can use the <<- operator (double
headed arrow) like this...

mat <- function(i) {
  for (k in i:10) {
    y[k] <<- k+1
    f[k] <<- y[k-1] / 2
  }
}

Type ?"<<-" for the help page.

Michael


On 10 November 2010 18:09, rnick <nikos.rachmanis at gmail.com> wrote:
>
> Hi guys,
>
> Very new to R and your help would be highly appreciated for the following
> problem. I am trying to create a simple function which registers values
> within an array through a for loop. These are the steps I have followed:
>
> 1) Declared 2 global matrices
> 2) Create function mat() with i as an input
> 3) constructed the for loop
> 4) called mat(2)
>
> The problem is that when i try to get y[4] and f[5] the output is: [1] NA
>
> my concern is that i am not addressing any of the following topics:
> 1) definition of global variable
> 2) the argument does not go through the for loop
> 3) the matrices definition is not correct
> 4) the function do not return any values
> 4) other..
>
> My code is listed below:
>
> y=c(NA)
> f=c(NA)
> mat<-function(i)
> {
>        for (k in i:10)
>        {
>                y[k]=k+1
>                f[k]=y[k-1]/2
>        }
> }
> mat(2)
>
> Any thoughts or recommendations would be highly appreciated.
>
> Thanks in advance,
>
> N
> --
> View this message in context: http://r.789695.n4.nabble.com/Simple-Function-tp3035585p3035585.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>