diff options
Diffstat (limited to 'gn3/computations')
| -rw-r--r-- | gn3/computations/slink.py | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/gn3/computations/slink.py b/gn3/computations/slink.py index 928330d..7d13d91 100644 --- a/gn3/computations/slink.py +++ b/gn3/computations/slink.py @@ -46,6 +46,16 @@ If the two distances are different, throw an exception.""" "should be the same in both directions.").format( lists[i][j], lists[j][i])) +def raise_valueerror_on_negative_distances(lists): + """Check that distances between 'somethings' are all positive, otherwise, +raise an exception.""" + def zero_or_positive(val): + return val >= 0; + # flatten lists + flattened = [distance for child in lists for distance in child] + if not all(map(zero_or_positive, flattened)): + raise ValueError("Distances should be positive.") + 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. @@ -58,5 +68,6 @@ This description should be updated once the form/type of 'distance' identified." 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) + raise_valueerror_on_negative_distances(lists) #### END: Guard Functions #### return None |