Hello,
I would like to make a function which extracts a subset, from a dataset,
with only the columns that I want (specifying their names).
For example, having this matrix:
> mydata<-matrix(c(22,1,3,2001,24,5,7,2002,26,7,8,2002,28,5,7,2003),
byrow=TRUE, ncol=4, dimnames=list(c(1,2,3,4),
c("age","day","month","year")))
> mydata
age day month year
1 22 1 3 2001
2 24 5 7 2002
3 26 7 8 2002
4 28 5 7 2003
I would like to create a function like:
x<-function(names) {subset(mydata, select=names) }
So I can choose every time which columns select, i.e. when I call:
x("age,day")
it would returns:
age day
1 22 1
2 24 5
3 26 7
4 28 5
Obviously it is not working, and I don't know how to do to fix it. Do
you have any suggestion?
Thank you very much
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