#' Utilities for manipulation
#'
#' Convert angle to radian
#' @param angle Angle \code{angle}
#' @return radian
#' @export
#' @examples
#' angles <- 0:180
#' radian <- ang2rad(angle = angles)
ang2rad <- function(angle){
radian <- (angle/180)*pi
return(radian)
}
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