counting the number of values greater than 0 in R in multiple columns

Question

I have a dataset myDF in R with a the variables L1,L2,L3,L4. How can I get the number of observations in L2, L3, and L4 that area greater than 0?

I would like to use the

Answer 1

We can use

colSums(myDF[c("L2", "L3", "L4")] > 0)