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-rw-r--r--gn3/computations/slink.py8
1 files changed, 8 insertions, 0 deletions
diff --git a/gn3/computations/slink.py b/gn3/computations/slink.py
index d6f6028..704a0f4 100644
--- a/gn3/computations/slink.py
+++ b/gn3/computations/slink.py
@@ -12,6 +12,14 @@ def raise_valueerror_if_data_is_not_lists_or_tuples(lists):
if (not is_list_or_tuple(lists)) or (not all(map(is_list_or_tuple, lists))):
raise ValueError("Expected list or tuple")
+def raise_valueerror_if_lists_empty(lists):
+ """Check that the list and its direct children are not empty."""
+ def empty(lst):
+ return len(lst) == 0
+ if (empty(lists)) or not all(map(lambda x: not empty(x), lists)):
+ raise ValueError("List/Tuple should NOT be empty!")
+
def nearest(lists, i, j):
raise_valueerror_if_data_is_not_lists_or_tuples(lists)
+ raise_valueerror_if_lists_empty(lists)
return None