fix iteration_ids for zero length draws_lists

stan-dev · Feb 23, 2025 · 8d5fb87 · 8d5fb87
1 parent e96fe22
commit 8d5fb87
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Showing 2 changed files with 8 additions and 2 deletions.
diff --git a/R/draws-index.R b/R/draws-index.R
@@ -68,6 +68,10 @@ iteration_ids.draws_df <- function(x) {
 
 #' @export
 iteration_ids.draws_list <- function(x) {
+  if (!length(x) || !length(x[[1]])) {
+    # no chains or no variables within chains
+    return(integer(0))
+  }
   seq_along(x[[1]][[1]])
 }
 

diff --git a/man/u_scale.Rd b/man/u_scale.Rd