Le 23/04/2015 12:22, Virgil Stokes a écrit :
The following interesting example (random_data.py) is posted at:
http://matplotlib.org/1.4.2/examples/animation/random_data.html
import matplotlib.pyplot as plt
import matplotlib.animation as animation
import numpy as np
fig, ax = plt.subplots()
line, = ax.plot(np.random.rand(10))
ax.set_ylim(0, 1)
def update(data):
line.set_ydata(data)
return line,
def data_gen():
while True: yield np.random.rand(10)
ani = animation.FuncAnimation(fig, update, data_gen, interval=100)
plt.show()
This codes works; but, I am very confused by it. For example:
1. There are 3 positional arguments given for animation.FuncAnimation;
but, in the
API documentation for this class
(http://matplotlib.org/api/animation_api.html), only
two positional arguments are shown.
The third one is the third one,
"/frames/ can be a generator, an iterable, or a number of frames."
The name "data_gen" could suggest its meaning (after having read the
doc). Note please that the keyword parameters are specified extra.
2. data, the argument to the update function seems to be undefined.
FuncAnimation usually passes the frame number: 0, 1, 2, ... as the first
parameter of the update function, when "frames" is None, or the number
of frames. If - as here - the third parameter is a generator, it passes
the yielded data to update.
It may be used or not.
Please, in such cases test your programs by adding some simple tracing
contraptions, say, print(data) inside update.
Jerzy Karczmarczuk
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