# Re: [R] indexing within a function

From: Berton Gunter <gunter.berton_at_gene.com>
Date: Sat 21 Jan 2006 - 07:30:33 EST

Hmmm.. no one's responded yet...

**Please** Read An Introduction to R and the R Language Definition to learn how to write functions and specify arguments.

Lose the quotes around x and y in your function. x is a name. "x" is a character.

• Bert Gunter Genentech Non-Clinical Statistics South San Francisco, CA

"The business of the statistician is to catalyze the scientific learning process." - George E. P. Box

> -----Original Message-----
> From: r-help-bounces@stat.math.ethz.ch
> [mailto:r-help-bounces@stat.math.ethz.ch] On Behalf Of Arianne Albert
> Sent: Friday, January 20, 2006 11:27 AM
> To: r-help@stat.math.ethz.ch
> Subject: [R] indexing within a function
>
> Hello all,
>
> I've got a large set of data consisting of 2 continuous numerical
> variables, and 2 factors. I'm trying to write a function that will
> draw scatter plots of the 2 numerical variables for various
> combinations of the factors. The problem is that my function doesn't
> seem to understand what I want it to do even though the
> command works
> fine outside the function. Here is an example of what I'm
> trying to do:
>
> > time<-seq(1, 10, 1)
> > depth<-seq(10, 19, 1)
> > pop<-rep(1:5, times=2)
> > pop<-as.factor(pop)
> > id<-rep(c(6,7), times=5)
> > id<-as.factor(id)
>
> > mydf<-cbind(time,depth,pop,id)
> > mydf<-as.data.frame(mydf)
> > attach(mydf)
>
> > myfunc<-function(x, y){ #this is the type of function that's not
> working
> + xx<-time[pop=="x"&id=="y"]
> + print(xx)}
>
> > myfunc(1,6)
> numeric(0)
>
> But, if I just enter:
> >time[pop=="1"&id=="6"]
> [1] 1
>
> I get the right answer... Does anyone know why the indexing works
> outside the function, but not inside?
>
>
> Arianne Albert
> _______________________
> Arianne Albert (PhD candidate)
> Zoology Dept, UBC
> 6270 University Blvd
> Vancouver, BC, V6T 1Z4, Canada
> Ph: 604-822-5966
> email: albert@zoology.ubc.ca
> http://www.zoology.ubc.ca/~albert
>
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