[R] Variable scope in functions - best practices
bhh at xs4all.nl
Sun Jul 24 17:24:55 CEST 2011
Noah Silverman wrote:
> I'm working on coding some more complex things in R and have need to break
> much of the logic into functions.
> I have several "global" variables that I want to change with a given
> function. (The variable has a different value after the function is
> In other languages like C, this is simple. However, in R, if a function
> changes a variable, that change only occurs in the frame of that function.
> So, when the function returns, the old value is still there.
> Of course, I could just have the function return the value, but some
> functions change 5-6 variables. So, I could have a function return a
> list, and then parse that list every time, but that seems like an
> excessive amount of overhead. (Especially as some functions may be called
> many many times.)
Maybe this helps
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