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scale_vector.R
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scale_vector.R
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#' Scale a vector
#'
#' From every element in a vector, subtract `center` and
#' divide by `scale`.
#'
#' @param y A numeric vector.
#' @param center Either a function that computes center of data
#' (such as `mean`) or a single numeric value.
#' @param scale Either a function that computes variability of data
#' (such as `sd`) or a single numeric value.
#'
#' @return The same object as `y` just with every element scaled
#' @export
#'
#' @examples
#'
#' y <- 1:10
#' scale_vector(y)
#'
#' scale_vector(y, center = median, scale = IQR)
#'
#' scale_vector(y, center = 10, scale = 2)
scale_vector <- function(y, center = mean, scale = sd) {
# Preparation
cener_ <-
if (is.function(center)) {
center(y)
} else if (length(center) == 1) {
center
} else {
stop("Incorrect value of 'center'")
}
scale_ <-
if (is.function(scale)) {
scale(y)
} else if (length(scale) == 1) {
scale
} else {
stop("Incorrect value of 'scale'")
}
# Transformation
(y - cener_) / scale_
}