Python 计算函数的逆函数--库
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Calculate inverse of a function--Library
提问by username_4567
Is there any library available to have inverse of a function? To be more specific, given a function y=f(x)and domain, is there any library which can output x=f(y)? Sadly I cannot use matlab/mathematics in my application, looking for C/Python library..
是否有任何库可用于函数的反函数？更具体地说，给定一个函数y=f(x)和域，是否有可以输出的库x=f(y)？遗憾的是，我无法在我的应用程序中使用 matlab/mathematics，寻找 C/Python 库..
回答by ev-br
As has already been mentioned, not all functions are invertible. In some cases imposing additional constraints helps: think about the inverse of sin(x).
如前所述，并非所有函数都是可逆的。在某些情况下，施加额外的约束有助于：考虑 的倒数sin(x)。
Once you are sure your function has a unique inverse, solve the equation f(x) = y. The solution gives you the inverse, y(x).
一旦你确定你的函数有一个唯一的逆，解方程f(x) = y。该解决方案为您提供了相反的y(x).
In python, look for nonlinear solvers from scipy.optimize.
在 python 中，从scipy.optimize.
回答by alvarosg
I am a bit late, but for future readers of the post, I just published a python package that does this precisely. https://pypi.python.org/pypi/pynverseThere is a detailed description of how to use it and how it does it in the description!
我有点晚了，但对于这篇文章的未来读者，我刚刚发布了一个精确执行此操作的 python 包。https://pypi.python.org/pypi/pynverse在说明中有详细的使用方法和操作方法！
