Python:溢出错误:数学范围错误
声明:本页面是StackOverFlow热门问题的中英对照翻译,遵循CC BY-SA 4.0协议,如果您需要使用它,必须同样遵循CC BY-SA许可,注明原文地址和作者信息,同时你必须将它归于原作者(不是我):StackOverFlow
原文地址: http://stackoverflow.com/questions/4050907/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Python: OverflowError: math range error
提问by Harpal
I get a Overflow error when i try this calculation, but i cant figure out why.
尝试此计算时出现溢出错误,但我不知道为什么。
1-math.exp(-4*1000000*-0.0641515994108)
采纳答案by Glenn Maynard
The number you're asking math.exp to calculate has, in decimal, over 110,000 digits. That's slightly outside of the range of a double, so it causes an overflow.
您要求 math.exp 计算的数字以十进制表示,超过 110,000 位。这稍微超出了 double 的范围,因此会导致溢出。
回答by Alin Purcaru
This may give you a clue why:
这可能会给你一个线索:
http://www.wolframalpha.com/input/?i=math.exp%28-4*1000000*-0.0641515994108%29
Notice the 111442 exponent.
注意 111442 指数。
回答by MAK
I think the value gets too large to fit into a doublein python which is why you get the OverflowError. The largest value I can compute the expof on my machine in Python is just sligthly larger than 709.78271.
我认为该值太大而无法放入doublepython 中,这就是为什么你得到OverflowError. 我可以exp在我的机器上用 Python计算的最大值略大于 709.78271。
回答by Vatsal
To fix it use:
要修复它,请使用:
try:
ans = math.exp(200000)
except OverflowError:
ans = float('inf')
回答by mpetric
Try np.exp() instead of math.exp()
尝试 np.exp() 而不是 math.exp()
Numpy handles overflows more gracefully, np.exp(999) results in inf and 1. / (1. + np.exp(999)) therefore simply results in zero
Numpy 更优雅地处理溢出, np.exp(999) 导致 inf 和 1. / (1. + np.exp(999)) 因此只会导致零
import math
import numpy as np
print(1-np.exp(-4*1000000*-0.0641515994108))
回答by anonymous
Unfortunately, no one explained what the real solution was. I solved the problem using:
不幸的是,没有人解释真正的解决方案是什么。我使用以下方法解决了问题:
from mpmath import *
从 mpmath 导入 *
You can find the documentation below:
您可以在下面找到文档:

