add time assertion

tskit-dev · Dec 18, 2024 · 587409b · 587409b
1 parent 7ca6452
commit 587409b
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/python/tskit/trees.py b/python/tskit/trees.py
@@ -8751,6 +8751,7 @@ def pca(
         if time_window is None:
             tree_sequence_low, tree_sequence_high = None, self
         else:
+            assert time_windows[0] < time_windows[1], "The second argument should be larger."
             tree_sequence_low, tree_sequence_high = \
                 self.decapitate(time_window[0]), self.decapitate(time_window[1])