I am using numpy.log10 to calculate the log of an array of probability values. There are some zeros in the array, and I am trying to get around it using result = numpy.where(prob > 0.0000000001, numpy.log10(prob), -10) However, RuntimeWarning: divide by zero encountered in log10 still appeared and I am sure it is this line caused the warning. Although my problem is solved, I am confused why this warning appeared again and again? Continue reading...