rowGrpSds {wrMisc}

Per line and per group sd-values

Description

rowGrpSds calculate Sd (standard-deviation) for matrix with multiple groups of data, ie one sd for each group of data. Groups are specified as columns of 'x' in 'grp' (so length of grp should match number of columns of 'x', NAs are allowed).

Usage

rowGrpSds(x, grp)

Arguments

x

matrix where relplicates are organized into seprate columns

grp

(character or factor) defining which columns should be grouped (considered as replicates)

Value

This function returns a matrix of sd values

See Also

rowGrpMeans, rowCVs, rowSEMs,sd

Examples

set.seed(2016); dat1 <- matrix(c(runif(200) +rep(1:10,20)), ncol=10)
head(rowGrpSds(dat1, gr=gl(4,3,labels=LETTERS[1:4])[2:11]))