def path_length(tree):
'''Get the path length from a sub-tree to the root node'''
t = tree
l2 = []
while t.parent is not None:
l2.append(mm.segment_length2((t.parent.value, t.value)))
t = t.parent
return np.sum(np.sqrt(l2))
def test_segment_length2():
p1 = Point(3.0, 4.0, 5.0, 3.0)
p2 = Point(4.0, 5.0, 6.0, 3.0)
dist = mm.segment_length2((p1, p2))
assert dist == 3
def test_segment_length2():
p1 = Point(3.0, 4.0, 5.0, 3.0, 1)
p2 = Point(4.0, 5.0, 6.0, 3.0, 1)
dist = mm.segment_length2((p1, p2))
nt.eq_(dist, 3)
