I'd like to perform return variable assignments like matlab. For example,
the following function would return A, B, and c to the script that called
it.
=================================
function [A,B,c] = simple(m,n)
A=[ 3 2; 3 3]
B=m
c=1:n
=================================
I'd like to do similar assignments in R, but I seem to be able to only
return one variable. I tried to use a list to return all the arguments, but
then each has to be referred to using the list. For example:
=================================
simple <- function(m,n) {
A=matrix(c(3,3,2,3),2,2)
B=m
c=1:n
list(A=A,B=B,c=c)
}
> stuff=simple(2,3)
> stuff
$A
[,1] [,2]
[1,] 3 2
[2,] 3 3
$B
[1] 2
$c
[1] 1 2 3
=================================
Then I could assign each variable like this (which is what I'd like to
avoid):
=================================
A=stuff$A
B=stuff$B
c=stuff$c
rm(stuff) #stuff isn't needed anymore.
=================================
I've even toyed with the superassignment operator, which also works, but I
think it doesn't work for functions of functions. The following example
works.
=================================
simple2 <- function(m,n) {
A <<- matrix(c(3,3,2,3),2,2)
B <<- m
c <<- 1:n
}
> stuff2=simple2(2,3)
> stuff2
[1] 1 2 3
> A
[,1] [,2]
[1,] 3 2
[2,] 3 3
> B
[1] 2
> c
[1] 1 2 3
=================================
In the example below, I call the function ten inside the function nine. I'm
expecting that the variable b should change only in the function nine (and
not in the global environment). In other words, I think the line "(nine) b=
9" should be "(nine) b= 10".
Can someone help me know how to do this correctly?
-Scott
=================================
nine = function(a) {
b <- 9
ten(a)
print(paste("(nine) b=",b))
}
ten = function(d) {
b <<- 10
print(paste("(ten) b=",b))
print(paste("(ten) d=",d))
d
}
> nine(5)
[1] "(ten) b= 10"
[1] "(ten) d= 5"
[1] "(nine) b= 9"
> b
[1] 10
=================================
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