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
NAs are ignored from data.
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)
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