How to find gradient of multiple variables at a given point?-CodePudding

I need to find gradient of function (x**2 y) at point [2, 4].

import numdifftools as nd
import sympy as sym
from sympy import *

x, y = sym.symbols('x y')

def rosen(x, y): 
    return (x**2   y)
grad = nd.Gradient(rosen)([2, 4])
print("Gradient of is ", grad)

TypeError: rosen() missing 1 required positional argument: 'y'

CodePudding user response：

Argument to function passed to nd.Gradient must be an array.

import numdifftools as nd

def rosen(xy): 
    return (xy[0]**2   xy[1])

grad = nd.Gradient(rosen)([2, 4])
print("Gradient of is ", grad)