# Possible methods
```python
from matplotlib import animation, rc
#
# other code
#
anim = animation.FuncAnimation(fig, animate, init_func=init,
frames=100, interval=100, blit=True)
# below is the part which makes it work on Colab
rc('animation', html='jshtml')
anim # or HTML(anim.to_jshtml())
```
However, how to use animation inside Class member function?
Use **animation install** as globle variable.
# Sample
```python
import numpy as np
import matplotlib.pyplot as plt
from matplotlib import animation, rc
from IPython.display import HTML
class testAnimation:
def __init__(self):
# First set up the figure, the axis, and the plot element we want to animate
self.fig, ax = plt.subplots()
plt.close()
ax.set_xlim(( 0, 2))
ax.set_ylim((-2, 2))
self.line, = ax.plot([], [], lw=2)
# initialization function: plot the background of each frame
def init(self):
self.line.set_data([], [])
return (self.line,)
# animation function. This is called sequentially
def animate(self, i):
x = np.linspace(0, 2, 1000)
y = np.sin(2 * np.pi * (x - 0.01 * i))
self.line.set_data(x, y)
return (self.line,)
def draw(self):
global anim
anim = animation.FuncAnimation(self.fig, self.animate, init_func=self.init,
frames=100, interval=100, blit=True)
vis = testAnimation()
vis.draw()
# Note: below is the part which makes it work on Colab
rc('animation', html='jshtml')
anim
```
# References
- [korakot/animation.py](https://gist.github.com/korakot/b3c9b90d4f10dc3883c003697bf95bf4)
- [matplotlib.animation.FuncAnimation](https://matplotlib.org/3.1.1/api/_as_gen/matplotlib.animation.FuncAnimation.html#matplotlib.animation.FuncAnimation)
- [Colab animations.ipynb](https://colab.research.google.com/drive/1lnl5UPFWVPrryaZZgEzd0theI6S94c3X#scrollTo=QLRBwgFqdr83)
Colab: How to use matplotlib animation in Colab?
# Problem:
How to use animation inside Class member function in Colab?
---
Colab 是谷歌开发的一款类似于Jupter notebook的编辑器，用Colab可以编写Python程序，进行深度学习相关的开发。
即使您的电脑上没有GPU，也可以利用此编辑器进行神经网络的训练。
当我尝试使用Coloab来写 《概率机器人 详解》这本书的程序时遇到了matplotlib animation 动画不能显示的问题。
本文示例将介绍一种方法来解决这个问题。
本文将介绍如何在Python的类中使用animation.FuncAnimation函数：
```sh
anim = animation.FuncAnimation(self.fig, self.animate, init_func=self.init,
frames=100, interval=100, blit=True)
```
默认情况下，Colab是不显示动画的。
为了兼容Colab， 我采用的解决方案是:
```sh
rc('animation', html='jshtml')
anim
```
将anim声明成全局变量，然后在程序末尾加上上述两句。
注： 如果animation.FuncAnimation不是在类成员函数中调用的话，也需要加上上述两名话。
---
Related modules:
- matplotlib
- Colab
# Possible methods
```python
from matplotlib import animation, rc
#
# other code
#
anim = animation.FuncAnimation(fig, animate, init_func=init,
frames=100, interval=100, blit=True)
# below is the part which makes it work on Colab
rc('animation', html='jshtml')
anim # or HTML(anim.to_jshtml())
```
However, how to use animation inside Class member function?
Use **animation install** as globle variable.
# Sample
```python
import numpy as np
import matplotlib.pyplot as plt
from matplotlib import animation, rc
from IPython.display import HTML
class testAnimation:
def __init__(self):
# First set up the figure, the axis, and the plot element we want to animate
self.fig, ax = plt.subplots()
plt.close()
ax.set_xlim(( 0, 2))
ax.set_ylim((-2, 2))
self.line, = ax.plot([], [], lw=2)
# initialization function: plot the background of each frame
def init(self):
self.line.set_data([], [])
return (self.line,)
# animation function. This is called sequentially
def animate(self, i):
x = np.linspace(0, 2, 1000)
y = np.sin(2 * np.pi * (x - 0.01 * i))
self.line.set_data(x, y)
return (self.line,)
def draw(self):
global anim
anim = animation.FuncAnimation(self.fig, self.animate, init_func=self.init,
frames=100, interval=100, blit=True)
vis = testAnimation()
vis.draw()
# Note: below is the part which makes it work on Colab
rc('animation', html='jshtml')
anim
```
# References
- [korakot/animation.py](https://gist.github.com/korakot/b3c9b90d4f10dc3883c003697bf95bf4)
- [matplotlib.animation.FuncAnimation](https://matplotlib.org/3.1.1/api/_as_gen/matplotlib.animation.FuncAnimation.html#matplotlib.animation.FuncAnimation)
- [Colab animations.ipynb](https://colab.research.google.com/drive/1lnl5UPFWVPrryaZZgEzd0theI6S94c3X#scrollTo=QLRBwgFqdr83)
# Possible methods
```python
from matplotlib import animation, rc
#
# other code
#
anim = animation.FuncAnimation(fig, animate, init_func=init,
frames=100, interval=100, blit=True)
# below is the part which makes it work on Colab
rc('animation', html='jshtml')
anim # or HTML(anim.to_jshtml())
```
However, how to use animation inside Class member function?
Use **animation install** as globle variable.
# Sample
```python
import numpy as np
import matplotlib.pyplot as plt
from matplotlib import animation, rc
from IPython.display import HTML
class testAnimation:
def __init__(self):
# First set up the figure, the axis, and the plot element we want to animate
self.fig, ax = plt.subplots()
plt.close()
ax.set_xlim(( 0, 2))
ax.set_ylim((-2, 2))
self.line, = ax.plot([], [], lw=2)
# initialization function: plot the background of each frame
def init(self):
self.line.set_data([], [])
return (self.line,)
# animation function. This is called sequentially
def animate(self, i):
x = np.linspace(0, 2, 1000)
y = np.sin(2 * np.pi * (x - 0.01 * i))
self.line.set_data(x, y)
return (self.line,)
def draw(self):
global anim
anim = animation.FuncAnimation(self.fig, self.animate, init_func=self.init,
frames=100, interval=100, blit=True)
vis = testAnimation()
vis.draw()
# Note: below is the part which makes it work on Colab
rc('animation', html='jshtml')
anim
```
# References
- [korakot/animation.py](https://gist.github.com/korakot/b3c9b90d4f10dc3883c003697bf95bf4)
- [matplotlib.animation.FuncAnimation](https://matplotlib.org/3.1.1/api/_as_gen/matplotlib.animation.FuncAnimation.html#matplotlib.animation.FuncAnimation)
- [Colab animations.ipynb](https://colab.research.google.com/drive/1lnl5UPFWVPrryaZZgEzd0theI6S94c3X#scrollTo=QLRBwgFqdr83)
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