r - How can i rapidly explore the classes of all columns in a dataframe? -

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i want rapidly explore classes of columns in dataframe, made function print columns names , arrange them class. want tell me numbers of columns aren't of class factor.

columnsclass<-function (x){ a<-vector() b<-vector(mode="character") c<-vector c=0 (i in 1:dim(x)[2]){ a[i]<-paste(class(x[,i]),names(x)[i],sep="--") if (class(x[,i])!= "factor"){ c<-c+1 b[c]<<-i }} #1st print print(sort(a)) #2nd print print(paste("columns aren't factors number:",paste(b,collapse=","),collapse="  "))     }

however when run it, doesn't #2nd print though code working.

> columnsclass(cars)  [1] "numeric--dist"  "numeric--speed" [1] "columns aren't factors number: " #it doesn't print numbers of columns of class factor if run separately ,it  runs > print(paste("columns aren't factors   number:",paste(b,collapse=","),collapse="  ")) [1] "columns aren't factors number: 1,2"

here's function takes account pierre's comments, simplifies a's calculation well:

columnsclass <- function(x){   nm <- sapply(x, class)   <- paste(nm, names(nm), sep = "--")   b <- which(!sapply(x, is.factor))   # 1st print   print(sort(a))   # 2nd print   print(paste("columns aren't factors number:",      paste(b, collapse = ","), collapse = "  "))     } > columnsclass(cars) [1] "numeric--dist"  "numeric--speed" [1] "columns aren't factors number: 1,2"

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