[R] Re use objects from within a custom made function

[Tony Plate]

test$x doesn't evaluate the function, you want something like test(1,2)$x, e.g.:

test <- function(i, j){
	x <- i:j
	y <- i*j
	z <- i/j
	return(list(x=x,y=y,z=z))
}

> test(1,2)$x
[1] 1 2
> test(1,2)$y
[1] 2
> test(1,2)$z
[1] 0.5
> 

Or if you want to avoid evaluating your function multiple times:

> res <- test(1,2)
> res$x
[1] 1 2
> res$y
[1] 2
> res$z
[1] 0.5
> res
$x
[1] 1 2

$y
[1] 2

$z
[1] 0.5

> 


Stropharia wrote:
> Hi everyone,
> 
> i'm having a problem extracting objects out of functions i've created, so i
> can use them for further analysis. Here's a small example:
> 
> # ---------------------------
> test <- function(i, j){
> 	x <- i:j
> 	y <- i*j
> 	z <- i/j
> 	return(x,y,z)
> }
> # ---------------------------
> 
> This returns the 3 objects as $x, $y and $z. I cannot, however, access these
> objects individually by typing for example:
> 
> test$x
> 
> I know i can do this by adding an extra arrow head to the assignment arrow
> (<<-), but I am sure that is not how it is done in some of the established R
> functions (like when calling lm$coef out of the lm function). Is there a
> simple command i've omitted from the function that allows access to objects
> inside it?
> 
> Thanks in advance,
> 
> Steve