I am trying to modify a dataframe by converting multiple integer variables to factors.
A simple dataframe for illustrative purposes is the following:
mydf<-data.frame(x=1:10, y=11:20, z=21:30)
Let's say I would like to change the first two columns from int to factor. In order to achieve this I could write
mydf[,1] <- as.factor(mydf[,1])
mydf[,2] <- as.factor(mydf[,2])
This piece code works but if I have to change many columns, I will have to repeat this piece of code many times. I have tried
mydf[,c(1,2)]<-as.factor(mydf[,c(1,2)])
but the output is
str(mydf)
'data.frame': 10 obs. of 3 variables:
$ x: chr "1:10" "11:20" "1:10" "11:20" ...
$ y: chr "1:10" "11:20" "1:10" "11:20" ...
$ z: int 21 22 23 24 25 26 27 28 29 30
How can I achieve my target in a more elegant and neat way? Thanks!
