def test_euclidean_distance(self):
"""euclidean_distance: should return dist between 2 vectors or matrices
"""
a = array([3,4])
b = array([8,5])
c = array([[2,3],[4,5]])
d = array([[1,5],[8,2]])
self.assertFloatEqual(euclidean_distance(a,b),sqrt(26))
self.assertFloatEqual(euclidean_distance(c,d),sqrt(30))
def test_euclidean_distance_unexpected(self):
"""euclidean_distance: works always when frames are aligned. UNEXPECTED!
"""
a = array([3,4])
b = array([8,5])
c = array([[2,3],[4,5]])
d = array([[1,5],[8,2]])
e = array([[4,5],[4,5],[4,5]])
f = array([1,1,1,1,1])
self.assertFloatEqual(euclidean_distance(a,c),sqrt(4))
self.assertFloatEqual(euclidean_distance(c,a),sqrt(4))
self.assertFloatEqual(euclidean_distance(a,e),sqrt(6))
#IT DOES RAISE AN ERROR WHEN THE FRAMES ARE NOT ALIGNED
self.assertRaises(ValueError,euclidean_distance,c,e)
self.assertRaises(ValueError,euclidean_distance,c,f)
def distance(self,other):
"""Calculates the distance between two BaseUsages.
Distance is measured in three directions, CG-content, CU-content, and
GU-content.
"""
return euclidean_distance(array(self.toCartesian()),\
array(other.toCartesian()))
