尽管输入了正确的数字，但 arguments 的数字无效

Question

import numpy as np

class Body(object): # Class for planets / moons / asteroids
    
    def __init__(self, mass, velocity, position):
        
        self.mass = mass  # Defining variables
        self.velocity = velocity
        self.position = position
        
        
    def move(self, force, t):
        self.velocity = np.add(self.velocity + force * t / self.mass) # Code to move with time t
        self.position = np.add(self.position + self.velocity * t)
        return self
        
def main():
    
    mars = Body(6.4185*10**23, np.array([0, 0]), np.array([0, 0]))
    mars.move(np.array([10, 10]), 10) # Force defined to be [10, 10] and time 10
    
    
main()

Error

Traceback (most recent call last):
  File "c:\Users\p\Documents\dev\sodump\npadd.py", line 23, in <module>
    main()
  File "c:\Users\p\Documents\dev\sodump\npadd.py", line 20, in main
    mars.move(np.array([10, 10]), 10) # Force defined to be [10, 10] and time 10
  File "c:\Users\p\Documents\dev\sodump\npadd.py", line 13, in move
    self.velocity = np.add(self.velocity + force * t / self.mass) # Code to move with time t
ValueError: invalid number of arguments

Answer 1

The error is self.velocity = np.add(self.velocity + force * t / self.mass) . You pass only 1 argument while you need to pass 2 arguments. Seehttps://numpy.org/doc/stable/reference/generated/numpy.add.html