[R] indexing within a function
Arianne Albert
albert at zoology.ubc.ca
Fri Jan 20 20:26:51 CET 2006
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?
Thanks in advance,
Arianne Albert
_______________________
Arianne Albert (PhD candidate)
Zoology Dept, UBC
6270 University Blvd
Vancouver, BC, V6T 1Z4, Canada
Ph: 604-822-5966
email: albert at zoology.ubc.ca
http://www.zoology.ubc.ca/~albert
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