Strange behavior when using apply with rank and order on a data.frame with ordered factors

Question

I\'ve found some weird behavior with apply.

Assume I have an arbitrary matrix of ordered variables

set.seed(4)
x <- ordered(sample(1:10,          


        

Answer 1

I am not sure why the extract reason for that happen to apply function. But you could try sapply to solve the problem.

rankmat3 <- as.data.frame(sapply(data1, rank))

The result would be like:

rankmat3
    x y z
1 4.0 3 4
2 1.0 1 1
3 2.5 2 3
4 2.5 4 2