added as.character() and duplicated() methods

NAMESPACE

@@ -2,6 +2,7 @@
 
 S3method("[",distribution)
 S3method("names<-",distribution)
+S3method(as.character,distribution)
 S3method(as.data.frame,distribution)
 S3method(as.list,distribution)
 S3method(as.matrix,distribution)
@@ -41,6 +42,7 @@ S3method(cdf,ZTNegativeBinomial)
 S3method(cdf,ZTPoisson)
 S3method(dim,distribution)
 S3method(dimnames,distribution)
+S3method(duplicated,distribution)
 S3method(fit_mle,Bernoulli)
 S3method(fit_mle,Binomial)
 S3method(fit_mle,Exponential)

NEWS.md

@@ -20,10 +20,18 @@
   simplified. For example, now `Normal(mu = 0, sigma = 1)` is used instead of
   `Normal distribution (mu = 0, sigma = 1)` in order to yield a more compact output, especially
   for vectors of distributions (#101).
+- Added an `as.character()` method which essentially calls `format(..., digits = 15, drop0trailing = TRUE)`.
+  This mimics the behavior and precision of base R for real vectors. Note that this enables
+  using `match()` for distribution objects.
+- Added a `duplicated()` method which relies on the corresponding method for the `data.frame`
+  of parameters in a distribution.
 - Fixed errors in notation of cumulative distribution function in the documentation of
   `HurdlePoisson()` and `HurdleNegativeBinomial()` (by @dkwhu in #94 and #96).
 - The `prodist()` method for `glm` objects can now also handle `family` specifications from
   `MASS::negative.binomial(theta)` with fixed `theta` (reported by Christian Kleiber).
+- Replace `ellipsis` dependency by `rlang` as the former will be
+  [deprecated/archived](https://rlang.r-lib.org/news/index.html#argument-intake-1-0-0)
+  (by @olivroy in #105).
 - Further small improvements in methods and manual pages.
 
 

R/utils.R

@@ -289,6 +289,19 @@ format.distribution <- function(x, digits = pmax(3L, getOption("digits") - 3L),
   setNames(f, n)
 }
 
+#' @export
+as.character.distribution <- function(x, digits = 15L, drop0trailing = TRUE, ...) {
+  y <- format(x, digits = digits, drop0trailing = drop0trailing, ...)
+  if (!is.null(names(y))) names(y) <- NULL
+  return(y)
+}
+
+#' @export
+duplicated.distribution <- function(x, incomparables = FALSE, ...) {
+  class(x) <- "data.frame"
+  duplicated(x, incomparables = incomparables, ...)
+}
+
 #' @export
 print.distribution <- function(x, digits = pmax(3L, getOption("digits") - 3L), ...) {
   if (length(x) < 1L) {