.rowGrpSds {wrMisc}

row group sd (main)

Description

This function calculates sd for matrix with multiple groups of data, ie one sd for each group of data.

Usage

.rowGrpSds(x, grp)

Arguments

x

numeric matrix where relplicates are organized into separate columns

grp

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

Value

This function returns a matrix of sd values per row and group of replicates

See Also

rowGrpCV, rowCVs, arrayCV, replPlateCV

Examples

set.seed(2016); dat1 <- matrix(c(runif(200)+rep(1:10,20)),ncol=10)
grp1 <- gl(4,3,labels=LETTERS[1:4])[2:11]
head(.rowGrpSds(dat1, grp1))