[R] Re: Re: List and Column Names in a Function?

[Liaw, Andy]

> From: khobson at fd9ns01.okladot.state.ok.us
> 
> The solution that Douglas proposed does not work.  Any other ideas?

Then perhaps you could (re-)read the posting guide, and give us more
information on what you mean by "does not work", and exactly what you are
expecting?  Isn't this what you want?


> ds1 <- c(X=list(1:10), Y=list(11:20))
> ds <- function(myds, vec) myds[[vec]] * 2
> ds(ds1, "Y")
 [1] 22 24 26 28 30 32 34 36 38 40

Andy

 
> > In this simple function, how can I pass strings for index and column
> names
> > to the function?  I've posted this type of question before 
> and received
> no
> > response.
> >
> > Maybe this example will be easier to understand and troubleshoot.
> >
> > ds <- function(myds, vec) {myds[[vec]]*2}
> >
> > ds1 <- c(X=list(1:10), Y=list(11:20))
> >
> > ds(get("ds1"),get("Y"))
> 
> You are overusing the get function.  I think you can do what 
> you want as
> 
> ds(ds1, "Y")
> 
> 
> khobson at odot.org
> Kenneth Ray Hobson, P.E.
> Oklahoma DOT - QA & IAS Manager
> 
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> PLEASE do read the posting guide! 
> http://www.R-project.org/posting-guide.html
> 
> 
>