Python偏导数容易

Python partial derivatives easy

提问by cnrk

I'm interested in computing partial derivatives in Python. I've seen functions which compute derivatives for single variable functions, but not others.

我对在 Python 中计算偏导数感兴趣。我见过计算单变量函数的导数的函数，但不是其他函数。

It would be great to find something that did the following

找到执行以下操作的东西会很棒

    f(x,y,z) = 4xy + xsin(z)+ x^3 + z^8y
    part_deriv(function = f, variable = x)
    output = 4y + sin(z) +3x^2

Has anyone seen anything like this?

有没有人见过这样的事情？

采纳答案by wtayyeb

use sympy

用 sympy

>>> from sympy import symbols, diff
>>> x, y, z = symbols('x y z', real=True)
>>> f = 4*x*y + x*sin(z) + x**3 + z**8*y
>>> diff(f, x)
4*y + sin(z) + 3*x**2

回答by Nitish

Use sympy

用 sympy

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From their Docs:

从他们的文档：

>>> diff(sin(x)*exp(x), x)
 x           x
? ?sin(x) + ? ?cos(x)

and for your example:

和你的例子：

>>> diff(4*x*y + x*sin(z)+ x**3 + z**8*y,x)
3x**2+4*y+sin(z)