如何在代码中修复“ IndexError：标量变量的无效索引”

如何解决如何在代码中修复“ IndexError：标量变量的无效索引”

import numpy as np

import matplotlib.pyplot as plt
M = 1.0 # Mass of discus in kg
g = 9.81 # acceleration due to gravity (m/s^2)
V = 30 # Initial veLocity in m/s
ang = 30 # Angle of initial veLocity in degrees
Cd = 0.54 # Drag coefficient
Cl = 0.87
dt = 0.01 # time step in s
t = [0]
vx = [V*np.cos(ang/180*np.pi)]
vy = [V*np.sin(ang/180*np.pi)]
x = [0]
y = [1.8]
rho = 1.2 #density in kg/m^3
a_ref = 0.025 #area in m^2
gamma = 35/180*np.pi


drag=0.5 * rho * V**2 * a_ref * Cd
lift = 0.5 * rho * V**2 * a_ref * Cl
ax = ((rho*V**2*a_ref)/(2*M))*(-Cl *np.sin(gamma) - Cd * np.cos(gamma))
ay = ((rho*V**2*a_ref)/(2*M))*(Cl* np.cos(gamma) - Cd* np.sin(gamma)) -g

counter = 0

while (y[counter] >= 0):
    t.append(t[counter]+dt)
    vx.append(vx[counter]+dt*ax[counter])
    vy.append(vy[counter]+dt*ay[counter])
    x.append(x[counter]+dt*vx[counter])
    y.append(y[counter]+dt*vy[counter])
    vel = np.sqrt(vx[counter+1]**2 + vy[counter+1]**2)
    drag = 0.5 * rho * V**2 * a_ref * Cd
    lift = 0.5 * rho * V**2 * a_ref * Cl
    ax.append(((rho*V**2*a_ref)/(2*M))*(-Cl *np.sin(gamma) - Cd * np.cos(gamma)))
    ay.append(((rho*V**2*a_ref)/(2*M))*(Cl* np.cos(gamma) - Cd* np.sin(gamma)) -g)
    counter = counter +1

plt.plot(x,y,'ro')
plt.title("Womens discus!")
plt.ylabel("y (m)")
plt.xlabel("x (m)")

我需要在“ vx.append(vx[counter]+dt*ax[counter])”行中修复此错误，但是对于如何并且一直盯着这个问题已经好几个小时了，我还是一无所知。我不允许附加我的整个代码（太长），所以我只删除了变量和一些方程式。

请告诉我是否需要添加任何内容来帮助解决此问题任何帮助将不胜感激。 TIA

解决方法

该错误是由于您试图索引变量ax而引起的。此变量是一个numpy标量，因此无法编制索引。