使用 sympy 的偏导数

Question

I am trying to find partial derivative of a multi variate function using sympy but I am encountering the below problem.

Any help would be appreciated. Thank you

My Code:

import sympy as sym
x, y = sym.symbols('x y')
sym.diff(x**2 + 10*sin(x) + y**3, x)

Error:

NameError                                 Traceback (most recent call last)
<ipython-input-29-65fb237f8bc8> in <module>
  2 import math
  3 x, y = sym.symbols('x y')
----> 4 sym.diff(x**2 + 10*Sin(x) + y**3, x)

NameError: name 'sin' is not defined

Answer 1

You need to import the sin function from the library:

from sympy import sin

https://docs.sympy.org/latest/modules/functions/elementary.html#sin