Dear R-community,
I have been experiencing this issue with functions within a function and
I can kind of feel where the problem is (environments, closures etc),
but I don't manage to solve it.
I will sketch it with an example:
#We have two simple "inner" functions:
############## INNER FUNCTION1 #################
innerfunction1<-function()
{
ab<-a+b
cd<-c+d
innerfunctionlist<-list("ab"=ab,"cd"=cd)
}
################################################
############## INNER FUNCTION2 #################
innerfunction2<-function()
{
print(AB+CD)
}
################################################
#And we have a main script with a number of predefined variables.
#This shapes an environment in which variables that will be used
#by the inner function are defined.
############# MAIN SCRIPT ################
a=1
b=2
c=3
d=4
#source(filepath/to/innerfunction1)
outcome1<-innerfunction1()
AB <-outcome1$ab
CD <-outcome1$cd
#source(filepath/to/innerfunction2)
innerfunction2()
#################################################
#So far so good. No problem if you run this.
#The problem emerges if you want to make the main script a function.
#So now I wrap it into a function:
main<-function()
{
a=1
b=2
c=3
d=4
#source(filepath/to/innerfunction1)
outcome1<-innerfunction1()
AB <-outcome1$ab
CD <-outcome1$cd
#source(filepath/to/innerfunction2)
innerfunction2()
}
when I now run main() in an environment where all these variables are not
defined, I will get this error
message:
Error in innerfunction1() : object 'a' not found
I can solve this by defining the variables a, b, c and d. However, I
will then get next error message:
Error in print(AB + CD) : object 'AB' not found
I think I see what happens. The right variables are not present
in the right environment. Probably I did something silly, but I really
don't see how to solve this. Can someone please help me?
Many thanks!
Rik Verdonck
University of Leuven
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