The apply function operates on arrays, so your data frame is being converted to an array (matrix) before doing its thing. So use lapply or one of its variants. -- 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@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" > > > > >--- >Este email foi escaneado pelo Avast antivírus. >https://www.avast.com/antivirus > >______________________________________________ >R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see >https://stat.ethz.ch/mailman/listinfo/r-help >PLEASE do read the posting guide >http://www.R-project.org/posting-guide.html >and provide commented, minimal, self-contained, reproducible code. ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
