R/dhalfnorm.R

In BNPdensity: Ferguson-Klass Type Algorithm for Posterior Normalized Random Measures

#' Density half normal
#'
#' Computes the density.
#'
#' For internal use
#'
#' @keywords internal
#' @examples
#'
#' ## The function is currently defined as
#' function(x, mean = 0, sd = 1) {
#'   ifelse(x < 0, 0, 1) * dnorm(x, mean, sd) / (1 - pnorm(
#'     0, mean,
#'     sd
#'   ))
#' }
dhalfnorm <-
  function(x, mean = 0, sd = 1) {
    ifelse(x < 0, 0, 1) * dnorm(x, mean, sd) / (1 - pnorm(
      0, mean,
      sd
    ))
  }