Revert "Convert lists of matrices to draws_array objects"

This reverts commit 79d4521.

DESCRIPTION

@@ -1,7 +1,7 @@
 Package: posterior
 Title: Tools for Working with Posterior Distributions
-Version: 1.6.0.9000
-Date: 2024-12-02
+Version: 1.6.0
+Date: 2024-06-28
 Authors@R: c(person("Paul-Christian", "Bürkner", email = "[email protected]", role = c("aut", "cre")),
              person("Jonah", "Gabry", email = "[email protected]", role = c("aut")),
              person("Matthew", "Kay", email = "[email protected]", role = c("aut")),

NEWS.md

@@ -1,9 +1,3 @@
-# posterior 1.6.0+
-
-### Enhancements
-
-* Convert lists of matrices to `draws_array` objects.
-
 # posterior 1.6.0
 
 ### Enhancements

R/as_draws.R

@@ -76,11 +76,10 @@ closest_draws_format <- function(x) {
     out <- "rvars"
   } else if (is_draws_list_like(x)) {
     out <- "list"
-  } else {
-    stop_no_call(
-      "Don't know how to transform an object of class '",
-      class(x)[1L], "' to any supported draws format."
-    )
+  }
+  else {
+    stop_no_call("Don't know how to transform an object of class ",
+          "'", class(x)[1L], "' to any supported draws format.")
   }
   paste0("draws_", out)
 }

R/as_draws_array.R

@@ -130,11 +130,7 @@ as_draws_array.mcmc.list <- function(x, ...) {
 
 # try to convert any R object into a 'draws_array' object
 .as_draws_array <- function(x) {
-  if (is_matrix_list_like(x)) {
-    x <- as_array_matrix_list(x)
-  } else {
-    x <- as.array(x)
-  }
+  x <- as.array(x)
   new_dimnames <- list(iteration = NULL, chain = NULL, variable = NULL)
   if (!is.null(dimnames(x)[[3]])) {
     new_dimnames[[3]] <- dimnames(x)[[3]]
@@ -181,14 +177,7 @@ is_draws_array <- function(x) {
 
 # is an object looking like a 'draws_array' object?
 is_draws_array_like <- function(x) {
-  is.array(x) && length(dim(x)) == 3L ||
-    is_matrix_list_like(x)
-}
-
-# is an object likely a list of matrices?
-# such an object can be easily converted to a draws_array
-is_matrix_list_like <- function(x) {
-  is.list(x) && length(dim(x[[1]])) == 2L
+  is.array(x) && length(dim(x)) == 3L
 }
 
 #' Extract parts of a `draws_array` object

tests/testthat/test-as_draws.R

@@ -127,19 +127,6 @@ test_that("arrays can be transformed to draws_array objects", {
   expect_equal(nchains(y), 4)
 })
 
-test_that("lists of matrices can be transformed to draws_array objects", {
-  x <- round(rnorm(200), 2)
-  x <- matrix(x, nrow = 50)
-  colnames(x) <- paste0("theta", 1:4)
-  x <- list(x, x, x)
-
-  y <- as_draws(x)
-  expect_is(y, "draws_array")
-  expect_equal(variables(y), colnames(x[[1]]))
-  expect_equal(niterations(y), 50)
-  expect_equal(nchains(y), 3)
-})
-
 test_that("data.frames can be transformed to draws_df objects", {
   x <- data.frame(
     v1 = rnorm(100),