wrMisc (version 1.2.3)

colSds: sd for each column

Description

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.

Usage

colSds(dat)

Arguments

dat

matrix (or data.frame) with numeric values (may contain NAs)

Value

numeric vector of sd values

See Also

sd

Examples

# NOT RUN {
set.seed(2016); dat1 <- matrix(c(runif(200)+rep(1:10,20)),nc=10)
colSds(dat1)
# }