Sent from my phone. Please excuse my brevity.
On December 18, 2016 9:07:52 AM PST, "Cleber N.Borges via R-help" <r-help at r-project.org> wrote:
>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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