How do you find the largest/smallest number amongst several array's?
Combine your arrays into one, then take the min/max along the new axis. 
A = np.array([a1,a2, ... , an])
A.min(axis=0), A.max(axis=0)
I'm trying to get the largest/smallest number returned out of two or more numpy.array of equal length. Since max()/min() function doesn't work on multiple arrays, this is some of the best(worst) I've come up with:
max(max(a1), max(a2), max(a3), ...) / min(min(a1), min(a2), min(a3), ...)
Alternately one can use numpy's maximum, but those only work for two arrays at time.
Thanks in advance