Python TypeError：derivatives_circ（）需要2个位置参数，但是给出了6个

Question

我试图计算一些导数，以完成一些方程。但是当我定义我想要容纳6个不同变量的函数时。它给了我这个错误。

  File "C:\Users\Leona\Anaconda3\lib\site-packages\spyder\utils\site\sitecustomize.py", line 102, in execfile
    exec(compile(f.read(), filename, 'exec'), namespace)

  File "C:/Users/Leona/.matplotlib/Python_Dyn_Opdracht6_tweede.py", line 94, in <module>
    afgeleiden = derivatives_circ([theta[n], omega[n]], x[n], vx[n], y[n], vy[n], t[n])

TypeError: derivatives_circ() takes 2 positional arguments but 6 were given

这是我用来创建函数的代码

def derivatives_circ(state, t):             
    theta = state[0]                       
    omega = state[1]                        
    Moment=F*D
    alpha = Moment/Ig  
    
    x = state[2]
    vx = state[3]
    ax = F*np.cos(theta)/m 
    
    y = state[4]
    vy = state[5]
    ay = F*np.sin(theta)/m
    return [omega, alpha, vx, vy, ax, ay]



resultaat = odeint(derivatives_circ,[theta0, omega0, x0, vx0, y0, vy0], t)
theta = resultaat[:,0]
omega = resultaat[:,1]

x = resultaat[:,2]
vx = resultaat[:,3]

y = resultaat[:,4]
vy = resultaat[:,5]


for n in range(len(t)-1):
    if theta[n]<0.5*np.pi:
        
        afgeleiden = derivatives_circ([theta[n], omega[n]], x[n], vx[n], y[n], vy[n], t[n])
        omega[n+1] = omega[n] + afgeleiden[1]*dt 
        theta[n+1] = theta[n] + afgeleiden[0]*dt
        
        vx[n+1]=vx[n]+afgeleiden[3]*dt
        x[n+1]=x[n]+afgeleiden[2]*dt
        
        vy[n+1]=vy[n]+afgeleiden[5]*dt
        y[n+1]=y[n]+afgeleiden[4]*dt
    
    else:
        
        afgeleiden_circ = derivatives_circ([theta[n], omega[n]], x[n], vx[n], y[n], vy[n], t[n])
        omega[n+1] = omega[n] + afgeleiden_circ[1]*dt 
        theta[n+1] = theta[n] + afgeleiden_circ[0]*dt
        
        afgeleiden_lin = derivatives_circ([x[n],vx[n]],t[n])
        vx[n+1]=vx[n]+afgeleiden[3]*dt
        x[n+1]=x[n]+afgeleiden[2]*dt
        
        afgeleiden = derivatives_circ([y[n],vy[n]],t[n])
        vy[n+1]=vy[n]+afgeleiden_circ[5]*dt
        y[n+1]=y[n]+afgeleiden[4]*dt

真的很感激任何帮助！

Answer 1

这一行在这里：

afgeleiden = derivatives_circ([theta[n], omega[n]], x[n], vx[n], y[n], vy[n], t[n])

应该是：

afgeleiden = derivatives_circ([theta[n], omega[n], x[n], vx[n], y[n], vy[n]], t[n])

基于您之前对derivatives_circ的调用

Answer 2

在这一行：

def derivatives_circ(state, t):

你定义了这个函数，它需要2个参数，但是在这一行：

afgeleiden = derivatives_circ([theta[n], omega[n]], x[n], vx[n], y[n], vy[n], t[n])

你给它6个参数！这就是它给你错误的原因。我不知道你的代码背后的心态，但用这一行代替它：

afgeleiden = derivatives_circ([theta[n], omega[n], x[n], vx[n], y[n], vy[n]], t[n])

应该管用！