On Oct 12, 2009, at 7:06 PM, 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
Generally one assigns the resutlts of a function to an object name:
> ll <- test(1,2)
Warning message:
In return(x, y, z) : multi-argument returns are deprecated
> ll
$x
[1] 1 2
$y
[1] 2
$z
[1] 0.5
> str(ll)
List of 3
$ x: int [1:2] 1 2
$ y: num 2
$ z: num 0.5
So you would not get the warnings if you instead ended the function
with:
return(list(x,y,z) )
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
--
--
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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