[R] transform input argument (matrix) of function

[R. Michael Weylandt]

I'm afraid I don't really understand what you're searching for, but
note that your functions can be written without assignment/return:

fun3 <- function(x) invisible(cbind(xy[,1], xy[,2], xy[,1] + xy[,2]))

Cheers,
Michael

On Sat, Nov 17, 2012 at 3:41 PM, Omphalodes Verna
<omphalodes.verna at yahoo.com> wrote:
> Dear list!
>
> I would like to write a function to transform matrix, which is input argument of a written function. It is easy with new matrix (see below), but my idea is to transform input argument (matrix) of function without any additional matrixes. Here is an example:
>
> fun1 <- function(xy) {
> xy <- cbind(xy[,1], xy[,2], xy[,1] + xy[,2])
> return(xy)
> }
>
> df1 <- matrix(c(1,2,3,1,2,3), ncol = 2)
> fun1(df1)
>
> fun2 <- function(xy) {
> xy <- cbind(xy[,1], xy[,2], xy[,1] + xy[,2])
> return(invisible(xy))
> }
>
> fun2(df1)
> df1
>> should be
>      [,1] [,2] [,3]
> [1,]    1    1    2
> [2,]    2    2    4
> [3,]    3    3    6
>
> Thanks to all for help,
> OV
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>
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