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returning multiple values

4 messages · PRAGYA SUR, R. Michael Weylandt, Bert Gunter +1 more

R. Michael Weylandt
# 
Hi,

No, you won't be able to simply call "a" and have that work.

R returns these in a single object with components (elements) named a,b,c,d

Here's a concrete example:

func <- function(x, y) return(list(a = x+1, b = y + 2))

out <- func(3, 5)

out[["a"]] # or out$a

out[["b"]] # or out$b

give the desired results.

If you just do

func(3,5)

the value will be returned, but since it's not bound to a variable
name, simply thrown away.

Remember -- R is (almost) always pass-by-value, not by reference, and
has pretty strong scoping.

Best,
Michael
On Mon, Jul 9, 2012 at 1:02 PM, PRAGYA SUR <pragya1386 at gmail.com> wrote:
arun
# 
Hello,

Try this:
?meanfevs<-c(3.5,4.25,6.5)
?meanfevns<-c(4.7,3.23,7.6)
?pfevs<-c(1.2,2.8,3.2)
?pfevns<-c(4.2,3.2,8.2)
listret<-list(a=meanfevs,b=meanfevns,c=pfevs,d=pfevns)
listret
$a
[1] 3.50 4.25 6.50

$b
[1] 4.70 3.23 7.60

$c
[1] 1.2 2.8 3.2

$d
[1] 4.2 3.2 8.2


#To access the elements stored in e.g. "a"
listret[[1]]
#[1] 3.50 4.25 6.50
?listret[["a"]]
#[1] 3.50 4.25 6.50
?listret$a
#[1] 3.50 4.25 6.50
?listret$a[1]
#[1] 3.5
listret[[c(1,2)]]
#[1] 4.25



A.K.



----- Original Message -----
From: PRAGYA SUR <pragya1386 at gmail.com>
To: r-help at r-project.org
Cc: 
Sent: Monday, July 9, 2012 2:02 PM
Subject: [R] returning multiple values

I am running a program which has an output containing four vectors named
meanfevs, meanfevns, pfevs, pfevns. I wish to return all four and be able
to access them later. I used the command
return(list(a=meanfevs,b=meanfevns,c=pfevs,d=pfevns))
it did give me the ouput. However the values did not get stored in the
vectors a,b,c and d and i am not being able to access them later by just
calling a/b/c/d. Please help.

??? [[alternative HTML version deleted]]

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