function - Column standard deviation R

Question

(This question already has answers here): question from:https://stackoverflow.com/questions/18047896/column-standard-deviation-r

Answer 1

The general idea is to sweep the function across. You have many options, one is apply():

R> set.seed(42)
R> M <- matrix(rnorm(40),ncol=4)
R> apply(M, 2, sd)
[1] 0.835449 1.630584 1.156058 1.115269
R>