#' @title Presence of missing values
#'
#' @details
#' Internal function. \code{is_missing} is called by
#' \code{get_weights_nonmetric}
#'
#' @param x a list
#' @return vector indicating whether each element in x contains NAs
#' @keywords internal
#' @template internals
#' @export
is_missing <- function(x)
{
if (is.matrix(x)) {
num_miss = apply(x, 2, function(u) sum(is.na(u)))
} else {
num_miss = sum(is.na(x))
}
as.logical(sum(num_miss))
}
#' @title Normalize a vector
#'
#' @details
#' Internal function. \code{normalize} is called internally
#'
#' @param x a numeric vector
#' @return normalized vector
#' @keywords internal
#' @template internals
#' @export
normalize <- function(x)
{
if (!is.vector(x) || !is.numeric(x))
stop("\nA numeric vector is required")
# output
x / sqrt(sum(x * x))
}
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