R/ops.R

In r-quantities/quantities: Quantity Calculus for R Vectors

#' @rdname groupGeneric.quantities
#'
#' @examples
#' a <- set_quantities(1:3, m/s, 0.1)
#' b <- set_quantities(1:3, m/s, 0.1)
#' a + b
#' a * b
#' a / b
#' a = set_quantities(1:5, m, 0.1)
#' a %/% a
#' a %/% set_quantities(2)
#' set_quantities(1:5, m^2, 0.1) %/% set_quantities(2, m, 0.1)
#' a %% a
#' a %% set_quantities(2)
#' @export
Ops.quantities <- function(e1, e2) {
  simplify.old <- units_options("simplify")

  if (!.Generic %in% c("*", "/", "%/%") || isFALSE(simplify.old))
    return(reclass(NextMethod()))

  simplify.units <- units(NextMethod())
  on.exit(units_options(simplify=simplify.old))
  units_options(simplify=FALSE)

  set_units(reclass(NextMethod()), simplify.units, mode="standard")
}