RuntimeWarning:除以日志中遇到的零 [英] RuntimeWarning: divide by zero encountered in log

问题描述

我正在使用numpy.log10来计算概率值数组的对数.数组中有一些零，我正在尝试使用

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)

但是，RuntimeWarning: divide by zero encountered in log10仍然出现，并且我确定这是引起警告的行.

However, RuntimeWarning: divide by zero encountered in log10 still appeared and I am sure it is this line caused the warning.

尽管我的问题已解决，但我很困惑为什么一次又一次出现此警告?

Although my problem is solved, I am confused why this warning appeared again and again?

推荐答案

numpy.log10(prob)为prob的所有元素(甚至是where未选择的元素)计算以10为底的对数.如果需要，可以在使用对数消除问题之前，用10**-10或一些哑数值填充prob的零. (不过，请确保您不使用哑数值来计算prob > 0.0000000001.)

numpy.log10(prob) calculates the base 10 logarithm for all elements of prob, even the ones that aren't selected by the where. If you want, you can fill the zeros of prob with 10**-10 or some dummy value before taking the logarithm to get rid of the problem. (Make sure you don't compute prob > 0.0000000001 with dummy values, though.)

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