Why columns classes are function dependents?
Like this example:
> for( i in 1:5 ) print( class( iris[,i] ) )
[1] "numeric"
[1] "numeric"
[1] "numeric"
[1] "numeric"
[1] "factor"
>
> apply( iris, 2, class )
Sepal.Length Sepal.Width Petal.Length Petal.Width Species
"character" "character" "character" "character" "character"
>
> dat <- data.frame( v1=1:5, v2=letters[1:5] )
> dat
v1 v2
1 1 a
2 2 b
3 3 c
4 4 d
5 5 e
>
> summary( dat )
v1 v2
Min. :1 a:1
1st Qu.:2 b:1
Median :3 c:1
Mean :3 d:1
3rd Qu.:4 e:1
Max. :5
>
> apply( dat, 2, class )
v1 v2
"character" "character"
>
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