center function

Dataset center

Generic function to calculate the center of a compositional dataset

center(X, zero.rm = FALSE, na.rm = FALSE)

Arguments

• X: compositional dataset
• zero.rm: a logical value indicating whether zero values should be stripped before the computation proceeds.
• na.rm: a logical value indicating whether NA values should be stripped before the computation proceeds.

Examples

X = matrix(exp(rnorm(5*100)), nrow=100, ncol=5)
g = rep(c('a','b','c','d'), 25)
center(X)
(by_g <- by(X, g, center))
center(t(simplify2array(by_g)))