natural logarithm

基本解释

Replaces the current quaternion with its natural logarithm.
用当前四元数的自然对数替换此四元数。
The natural logarithm of this ratio is called the logarithmic decrement.
此比率自然对数称为对数的减量。
dict.cn
That is, given an argument x, the natural logarithm returns the power to which e must be raised to give the value x.
也就是给定一个参数 x，该自然对数返回 e 的几次幂等于给定的值 x。

a logarithm to the base e. Usually written loge or ln (Also called Napierian logarithm)&rarrcompare common logarithm