python - Matplotlib error Line2d object s not iterable error in tkinter callback nothing shows up

Question

代码如下所示。我正在尝试使用之前计算的矢量制作动画，打开图形窗口所以我知道它已经走到这一步并且矢量正在正确计算。但是 matplotlib 只输出图形窗口，我不知道为什么。请帮忙。

#finally animateing
fig = plt.figure()
ax = plt.axes(xlim = (-1000,1000) ,ylim = (-1000,1000))#limits were arbitrary
#line = ax.plot([],[])
line, = ax.plot([], [], lw=2)

# initialization function: plot the background of each frame
def init():
    line.set_data([], [])
    return line,


def animate(i):
 x = time_vec[i]
 y = complex_vec[i]
 #y1 = real_vec[i] 
 #y2 = modulus_vec[i]
 line.set_data(x,y)
 #line.set_data(x,y1)
 #line.set_data(x,y2) 
 return line,

animation_object = animation.FuncAnimation(fig, animate, init_func= init, frames = num_files,interval = 30, blit = True)

#turnn this line on to save as mp4
#anim.save("give it a name.mp4", fps = 30, extra-args = ['vcodec', 'libx264'])
plt.show()

完整的错误消息如下所示

    Traceback (most recent call last):
  File "the_animation.py", line 71, in <module>
    plt.show()
  File "/usr/lib/pymodules/python2.7/matplotlib/pyplot.py", line 145,     in show
    _show(*args, **kw)
  File "/usr/lib/pymodules/python2.7/matplotlib/backend_bases.py",     line 117, in __call__
    self.mainloop()
  File     "/usr/lib/pymodules/python2.7/matplotlib/backends/backend_tkagg.py", line     69, in mainloop
    Tk.mainloop()
  File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 366, in mainloop
    _default_root.tk.mainloop(n)
  File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 1484, in __call__
    def __call__(self, *args):

最小示例

import numpy as np
from matplotlib import pyplot as plt
from matplotlib import animation
complex_vec = np.arange(5,6,.001)
real_vec = np.arange(7,8,.001)
time_vec = np.arange(0,1,.001)
num_files = np.size(time_vec)
#creating the modulus vector
modulus_vec = np.zeros(np.shape(complex_vec))
for k in range (0,complex_vec.size):
    a = complex_vec[k]
    b = real_vec[k]
    calc_modulus = np.sqrt(a**2 + b**2)
    modulus_vec[k] = calc_modulus
#finally animateing
fig = plt.figure()
ax = plt.axes(xlim = (-1000,1000) ,ylim = (-1000,1000))#limits were     arbitrary
#line = ax.plot([],[])
line, = ax.plot([], [], lw=2)

# initialization function: plot the background of each frame
def init():
    line.set_data([], [])
    return line,


def animate(i):
    x = time_vec[i]
    y = complex_vec[i]
    y1 = real_vec[i] 
    y2 = modulus_vec[i]
    line.set_data(x,y)
    line.set_data(x,y1)
    line.set_data(x,y2) 
    return line,

animation_object = animation.FuncAnimation(fig, animate, init_func= init, frames = num_files,interval = 30, blit = True)

#turnn this line on to save as mp4
#anim.save("give it a name.mp4", fps = 30, extra-args = ['vcodec',     'libx264'])
plt.show()

Answer 1

这里的问题出在你的animate函数，你正在使用 set_data多次不做你认为它做的事。当它是一个集合时，您可以像追加一样使用它。参数应该是两个数组，包含该行各自的 x 和 y 值。这将使您的最小示例动画化:

import numpy as np
from matplotlib import pyplot as plt
from matplotlib import animation

complex_vec = np.arange(5,6,.001)
real_vec = np.arange(7,8,.001)
time_vec = np.arange(0,1,.001)
num_files = np.size(time_vec)

#creating the modulus vector
modulus_vec = np.zeros(np.shape(complex_vec))
for k in range (0,complex_vec.size):
    a = complex_vec[k]
    b = real_vec[k]
    calc_modulus = np.sqrt(a**2 + b**2)
    modulus_vec[k] = calc_modulus

#finally animateing
fig = plt.figure()
ax = plt.axes(xlim = (-1,1) ,ylim = (-1,15))#limits were     arbitrary
#line = ax.plot([],[])
line, = ax.plot([], [], lw=2)

# initialization function: plot the background of each frame
def init():
    line.set_data([], [])
    return line,

def animate(i):
    x = time_vec[i]
    y = complex_vec[i]
    y1 = real_vec[i] 
    y2 = modulus_vec[i]
    # notice we are only calling set_data once, and bundling the y values into an array
    line.set_data(x,np.array([y, y1, y2]))
    return line,

animation_object = animation.FuncAnimation(fig, 
                                           animate, 
                                           init_func= init, 
                                           frames = num_files,
                                           interval = 30, 
                                           blit = True)

#turnn this line on to save as mp4
#anim.save("give it a name.mp4", fps = 30, extra-args = ['vcodec',     'libx264'])
plt.show()

您之前的尝试是设置 x 和 y 值，然后用新的 x 和 y，然后再做一次。