Python: How to enable division by zero and return zero value?

Question

I have this following code that do help me reshape each lines in a file and perform simple division calculation. When divided by zero, this error occurred. Any helps are greatly appreciated.

print(np.sum(single / divisi * binary, axis = -1))
RuntimeWarning: divide by zero encountered in divide

print(np.sum(single / divisi * binary, axis = -1))
RuntimeWarning: invalid value encountered in multiply

Code

import numpy as np
from numpy import genfromtxt
import csv

binary = np.genfromtxt('binary.csv', delimiter = ',').reshape((-1, 101, 4))
single = np.genfromtxt('single.csv', delimiter = ',').reshape((-1, 4))
divisi = np.genfromtxt('divisi.csv', delimiter = ',').reshape((-1, 1, 4))

print(np.sum(single / divisi * binary, axis = -1))

The inclusion of this 4 lines or code still cannot solve it.

try:
    print(np.sum(single / divisi * binary, axis = -1))
except Exception:
    print(0)

Possible duplicate of [NumPy: Return 0 with divide by zero](http://stackoverflow.com/questions/26248654/numpy-return-0-with-divide-by-zero) — idjaw, Feb 25 '16 at 02:08

score 3 · Answer 1 · answered Feb 25 '16 at 04:43

I recommend you to read this page. https://docs.python.org/2/tutorial/errors.html

As far as I know, when division by zero errors occur, It is recommended to use the code as below

try:
    print(np.sum(single / divisi * binary, axis = -1))
except ZeroDivisionError as e:
    print(0)

score 1 · Answer 2 · answered Feb 25 '16 at 02:06

Just put your print in a try:except like this:

import numpy as np
from numpy import genfromtxt
import csv

binary = np.genfromtxt('binary.csv', delimiter = ',').reshape((-1, 101, 4))
single = np.genfromtxt('single.csv', delimiter = ',').reshape((-1, 4))
divisi = np.genfromtxt('divisi.csv', delimiter = ',').reshape((-1, 1, 4))

try:
    print(np.sum(single / divisi * binary, axis = -1))
except Exception:
    print(0)  #or print whatever you want when you divide by zero

This page might help you. http://stackoverflow.com/questions/26248654/numpy-return-0-with-divide-by-zero?lq=1 — Mark Skelton, Feb 25 '16 at 02:14

score 1 · Answer 3 · answered Feb 25 '16 at 02:49

1

How about this:

if (divisi == 0):
    print (0)
else:
    print(np.sum(single / divisi * binary, axis = -1))

answered Feb 25 '16 at 02:49

Michael S

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Python: How to enable division by zero and return zero value?

3 Answers3