CODEWITHSUNDEEP
rcategorical-data
vladimir
vladimir

Reputation: 3

R - create list with levels

I have a dataframe with large number of categorical variables. I need to create a list, where I would get the output similar to str(DF), but not truncated

Example: 

 Df <- data.frame(
   x = as.factor(sample(1:5,30,r=T)),
   y = as.factor(sample(1:5,30,r=T)),
   z = as.factor(sample(1:5,30,r=T)),
   w = as.factor(sample(1:5,30,r=T))
)
str(Df)

produces output like this:

x: Factor w/ 5 levels "1","2","3","4",..:

But this is insufficient for me, both because I need all levels, and because I have a large number of variables in the dataframe, so I also get the " [list output truncated]: message...

Ideal thing is to get what levels(Df$x) does for each variable. I hoped for this code to work:

attach(Df)
idnames <- names(Df)
levellist <- lapply(idnames, function(x) levels(x))
##

but it returns NULL for all variables..

Upvotes: 0

Views: 1734

Answers (1)

catastrophic-failure
catastrophic-failure

Reputation: 3905

levels works on factors, so use it on Df, which is a list of factors.

levellist <- lapply(Df, function(x) levels(x))

Upvotes: 1

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