numpy: Invalid value encountered in true_divide

Question

I have two numpy arrays and I am trying to divide one with the other and at the same time, I want to make sure that the entries where the divisor is 0, should just be replaced w

Answer 1

You may have a NAN, INF, or NINF floating around somewhere. Try this:

np.isfinite(diff_images).all()
np.isfinite(b_0).all()

If one or both of those returns False, that's likely the cause of the runtime error.

Answer 2

Another useful Numpy command is nan_to_num(diff_images) By default it replaces in a Numpy array; NaN to zero, -INF to -(large number) and +INF to +(large number)

You can change the defaults, see https://numpy.org/doc/stable/reference/generated/numpy.nan_to_num.html