def test_both():
"""signed and unsigned volumes should agree up to sign"""
random.seed(0) #make tests repeatable
for N in range(1,10):
pts = rand(N+1,N)
assert_almost_equal(fabs(signed_volume(pts)), unsigned_volume(pts))
def test_signed_volume():
cases = []
cases.append((array([[1],[2]]), 1))
cases.append((array([[5.5],[-10]]), -15.5))
cases.append((array([[0,0],[1,1],[1,0]]), -1.0/2.0))
cases.append((array([[0,0],[1,0],[1,1]]), 1.0/2.0))
cases.append((array([[0,0],[0,1],[1,0]]), -1.0/2.0))
cases.append((array([[5,5],[5,6],[6,5]]), -1.0/2.0))
cases.append((array([[0,0,0],[1,0,0],[0,1,0],[0,0,1]]), 1.0/6.0))
for s,v in cases:
assert_almost_equal(signed_volume(s), v)
