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 want to be using np.where. See the documentation.

angles = np.where(norms != 0, dots/norms, -2)

Angles will consist of downs/norms whenever norms != 0, and will be -2 otherwise. You will still get the RuntimeWarning, as np.where will still calculate the entire vector dots/norms internally, but you can safely ignore it.