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# File src/library/base/R/scale.R
# Part of the R package, http://www.R-project.org
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# A copy of the GNU General Public License is available at
# http://www.r-project.org/Licenses/
#
# 2012-05-22 C. Beleites: replace sweep by faster subtraction of
# `rep`eated center and scale, respectively.
scale <- function(x, center = TRUE, scale = TRUE) UseMethod("scale")
message ("Installing faster replacement for base::scale.")
scale.default <- function(x, center = TRUE, scale = TRUE){
x <- as.matrix(x)
if (isTRUE (center)) center <- colMeans(x, na.rm=TRUE)
if (is.numeric (center)){
if (length (center) != ncol (x))
stop("length of 'center' must equal the number of columns of 'x'")
x <- x - rep (center, each = nrow (x))#.center (x, center = center)
}
if (isTRUE (scale)) {
scale <- colSums (x^2, na.rm = TRUE)
n <- nrow (x) - colSums (is.na (x)) - 1L
n [n == 0L] <- 1
scale <- sqrt (scale / n)
}
if (is.numeric(scale)){
if (length (scale) != ncol (x))
stop("length of 'center' must equal the number of columns of 'x'")
x <- x / rep (scale, each = nrow (x))#.scale (x, scale)
}
if (is.numeric (center)) attr(x, "scaled:center") <- center
if (is.numeric (scale)) attr(x, "scaled:scale") <- scale
x
}
.test (scale) <- function (){
m <- matrix (1:12, 3, 4)
m [12] <- NA
checkEquals (scale (m), base::scale (m))
checkEquals (scale (m, center = FALSE), base::scale (m, center = FALSE))
checkEquals (scale (m, scale = FALSE), base::scale (m, scale = FALSE))
checkEquals (scale (m, center = FALSE), base::scale (m, center = FALSE))
checkEquals (scale (m, scale = FALSE), base::scale (m, scale = FALSE))
checkEquals (scale (m, center = FALSE, scale = FALSE),
base::scale (m, center = FALSE, scale = FALSE))
checkEquals (scale (m, center = 1 : 4), base::scale (m, center = 1 : 4))
checkEquals (scale (m, scale = 1 : 4), base::scale (m, scale = 1 : 4))
checkEquals (scale (m, center = 1 : 4, scale = 1 : 4),
base::scale (m, center = 1 : 4, scale = 1 : 4))
}
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