Home/ Questions/''runtimewarning: divide by zero encountered in log'' - What should I do?
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lenorepollich
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Asked: 2022-07-22T03:41:54+00:00 In:

”runtimewarning: divide by zero encountered in log” – What should I do?

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Hi guys! I encounter the ”runtimewarning: divide by zero encountered in log” error when I am using numpy.log10 to calculate the log of an array of probability values. 

The array has some zeros, and I’m attempting to get around this using:

result = numpy.where(prob > 0.0000000001, numpy.log10(prob), -10)

And then I get the message:

Error: runtimewarning: divide by zero encountered in log

I don’t know why this error occurs and how to fix? Can you help me?

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1 Answer

  1. Best Answer
    Expert

    Solution: Before taking the logarithm, you can use 10**-10 or some other dummy value to fill the prob‘s zeros. But be careful not to compute prob > 0.0000000001 using dummy values.

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