Question

我想更新我的2D图中的y数据，而不必每次都调用'plot'

from matplotlib.figure import Figure
fig = Figure(figsize=(12,8), dpi=100) 

for num in range(500):
   if num == 0:
     fig1 = fig.add_subplot(111)
     fig1.plot(x_data, y_data)
     fig1.set_title("Some Plot")
     fig1.set_ylabel("Amplitude")
     fig1.set_xlabel("Time")

  else:
     #fig1 clear y data
     #Put here something like fig1.set_ydata(new_y_data), except that fig1 doesnt have set_ydata attribute`

我可以清理并绘制500次，但它会减慢循环速度。还有其他选择吗？

Answer 1

有关mpl figure部分的描述，请参阅http://matplotlib.org/faq/usage_faq.html#parts-of-a-figure。

如果您正在尝试制作动画，请查看matplotlib.animation模块，该模块会为您处理大部分细节。

您正在直接创建Figure对象，因此我假设您知道自己在做什么，并且正在处理其他地方的画布创建，但是对于此示例，将使用pyplot界面来创建数字/轴

import matplotlib.pyplot as plt

# get the figure and axes objects, pyplot take care of the cavas creation
fig, ax = plt.subplots(1, 1)  # <- change this line to get your axes object differently
# get a line artist, the comma matters
ln, = ax.plot([], [])
# set the axes labels
ax.set_title('title')
ax.set_xlabel('xlabel')
ax.set_ylabel('ylabel')

# loop over something that yields data
for x, y in data_source_iterator:
   # set the data on the line artist
   ln.set_data(x, y)
   # force the canvas to redraw
   ax.figure.canvas.draw()  # <- drop this line if something else manages re-drawing
   # pause to make sure the gui has a chance to re-draw the screen
   plt.pause(.1) # <-. drop this line to not pause your gui

使用python中的matplotlib.figure更新绘图数据

1 个答案: