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-rw-r--r--gn3/computations/slink.py12
1 files changed, 12 insertions, 0 deletions
diff --git a/gn3/computations/slink.py b/gn3/computations/slink.py
index f3a6951..928330d 100644
--- a/gn3/computations/slink.py
+++ b/gn3/computations/slink.py
@@ -35,6 +35,17 @@ def raise_valueerror_if_child_list_distance_from_itself_is_not_zero(lists):
if not all(map(distance_is_zero, children_distances)):
raise ValueError("Distance of each child list/tuple from itself should be zero!")
+def raise_mirrorerror_of_distances_one_way_are_not_same_other_way(lists):
+ """Check that the distance from A to B, is the same as the distance from B to A.
+If the two distances are different, throw an exception."""
+ for i in range(len(lists)):
+ for j in range(len(lists)):
+ if lists[i][j] != lists[j][i]:
+ raise MirrorError(
+ ("Distance from one child({}) to the other ({}) "
+ "should be the same in both directions.").format(
+ lists[i][j], lists[j][i]))
+
def nearest(lists, i, j):
"""Computes some form of distance.
This is 'copied' over from genenetwork1, from https://github.com/genenetwork/genenetwork1/blob/master/web/webqtl/heatmap/slink.py#L42-L64.
@@ -46,5 +57,6 @@ This description should be updated once the form/type of 'distance' identified."
raise_valueerror_if_lists_empty(lists)
raise_lengtherror_if_child_lists_are_not_same_as_parent(lists)
raise_valueerror_if_child_list_distance_from_itself_is_not_zero(lists)
+ raise_mirrorerror_of_distances_one_way_are_not_same_other_way(lists)
#### END: Guard Functions ####
return None