sd for each column
colSds is a speed optimized sd for matrix or data.frames.
It and treats each line as an independent set of data for calculating the sd (equiv to apply(dat,1,sd)).
NAs are ignored from data.
colSds(dat)
dat |
matrix (or data.frame) with numeric values (may contain NAs) |
numeric vector of sd values
set.seed(2016); dat1 <- matrix(c(runif(200)+rep(1:10,20)),nc=10) colSds(dat1)
Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.