Why there are two camPosToQuaternion functions? #10

In the file utilites_math.py, there exist two two camPosToQuaternion functions. I get the same input to these two functions and they return different results.
`def camPosToQuaternion(cx, cy, cz):
camDist = math.sqrt(cx * cx + cy * cy + cz * cz)
cx = cx / camDist
cy = cy / camDist
cz = cz / camDist
axis = (-cz, 0, cx)
angle = math.acos(cy)
a = math.sqrt(2) / 2
b = math.sqrt(2) / 2
w1 = axis[0]
w2 = axis[1]
w3 = axis[2]
c = math.cos(angle / 2)
d = math.sin(angle / 2)
q1 = a * c - b * d * w1
q2 = b * c + a * d * w1
q3 = a * d * w2 + b * d * w3
q4 = -b * d * w2 + a * d * w3
return (q1, q2, q3, q4)

def quaternionFromYawPitchRoll(yaw, pitch, roll):
c1 = math.cos(yaw / 2.0)
c2 = math.cos(pitch / 2.0)
c3 = math.cos(roll / 2.0)
s1 = math.sin(yaw / 2.0)
s2 = math.sin(pitch / 2.0)
s3 = math.sin(roll / 2.0)
q1 = c1 * c2 * c3 + s1 * s2 * s3
q2 = c1 * c2 * s3 - s1 * s2 * c3
q3 = c1 * s2 * c3 + s1 * c2 * s3
q4 = s1 * c2 * c3 - c1 * s2 * s3
return (q1, q2, q3, q4)

def camPosToQuaternion(cx, cy, cz):
q1a = 0
q1b = 0
q1c = math.sqrt(2) / 2
q1d = math.sqrt(2) / 2
camDist = math.sqrt(cx * cx + cy * cy + cz * cz)
cx = cx / camDist
cy = cy / camDist
cz = cz / camDist
t = math.sqrt(cx * cx + cy * cy)
tx = cx / t
ty = cy / t
yaw = math.acos(ty)
if tx > 0:
yaw = 2 * math.pi - yaw
pitch = 0
tmp = min(max(txcx + tycy, -1),1)
#roll = math.acos(tx * cx + ty * cy)
roll = math.acos(tmp)
if cz < 0:
roll = -roll
print("%f %f %f" % (yaw, pitch, roll))
q2a, q2b, q2c, q2d = quaternionFromYawPitchRoll(yaw, pitch, roll)
q1 = q1a * q2a - q1b * q2b - q1c * q2c - q1d * q2d
q2 = q1b * q2a + q1a * q2b + q1d * q2c - q1c * q2d
q3 = q1c * q2a - q1d * q2b + q1a * q2c + q1b * q2d
q4 = q1d * q2a + q1c * q2b - q1b * q2c + q1a * q2d
return (q1, q2, q3, q4)
`