Read ?apply and you shall be be enlightened. --Ista
On Dec 18, 2016 12:09 PM, "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 antivĂrus. > 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/posti > ng-guide.html > and provide commented, minimal, self-contained, reproducible code. [[alternative HTML version deleted]] ______________________________________________ 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.