Hi R,
Getting a strange result using ?apply. Please look into the below codes:
>
d=data.frame(a=c(1,2,3),b=c("A","B","C"),c=c(TRUE,FALSE,FALSE),d=c(T,F,F
))
> class(d[,1])
[1] "numeric"
> class(d[,2])
[1] "factor"
> class(d[,3])
[1] "logical"
> class(d[,4])
[1] "logical"
> apply(d,2,class)
a b c d
"character" "character" "character" "character"
> apply(d[,c(1,3)],2,class)
a c
"numeric" "numeric"
> apply(d[,c(3,4)],2,class)
c d
"logical" "logical"
> apply(d[,c(3,2)],2,class)
c b
"character" "character"
>
Why is this so? How do I get the actual classes of columns of my
dataframe d?
Thanks,
Shubha
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