RuntimeWarning: Divide by Zero error: How to avoid? PYTHON, NUMPY

Question

I am running in to RuntimeWarning: Invalid value encountered in divide

 import numpy
 a = numpy.random.rand((1000000, 100))
 b = numpy.random.rand((1,100))
          


        

Answer 1

you can ignore warings with the np.errstate context manager and later replace nans with what you want:

import numpy as np
angle = np.arange(-5., 5.) 
norm = np.arange(10.)
with np.errstate(divide='ignore'):
    print np.where(norm != 0., angle / norm, -2)
# or:
with np.errstate(divide='ignore'):
    res = angle/norm
res[np.isnan(res)] = -2