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#' A function to scale data to mean 0
#'
#' This function rescales the columns in a data matrix to have mean 0. The
#' variance is not scaled and missing values are ignored in the calculation.
#'
#'
#' @param DATA A (non-empty) matrix with data values. Columns should be
#' different traits and rows unique observations of those traits
#' @return Returns a matrix with the same dimensions as DATA.
#' @seealso \code{\link{ZTrans}}, \code{\link{PercentMax}}
#' @examples
#'
#' data(Nuclei)
#'
#' colMeans(Nuclei, na.rm=TRUE)
#'
#' Nuclei.MC<-MeanCent(Nuclei)
#'
#' colMeans(Nuclei.MC, na.rm=TRUE)
#'
#' @export MeanCent
MeanCent <- function(DATA) {
cmean <- apply(DATA, 2, mean, na.rm = TRUE)
cmat <- matrix(cmean, ncol = ncol(DATA), nrow = nrow(DATA),
byrow = TRUE)
muDAT <- DATA - cmat
return(muDAT)
} #end FUNCTION
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