matplotlib example animate (snippet)

Python matplotlib example 'animate'

Functions in program:

def animate(i): # i is the frame number
def init():

Modules used in program:

import numpy as np
import matplotlib

python animate

Python matplotlib example: animate

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

# first set up the figure and axis for the animation
fig, ax = plt.subplots()
line, = ax.plot([], [])
ax.set_xlim(0, 2)
ax.set_ylim(-2, 2)

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

# set up animation function
def animate(i):  # i is the frame number
    x = np.linspace(0, 2, 1000)
    y = np.sin(2 * np.pi * (x - 0.01 * i))  # plot 
    line.set_data(x, y)
    return line,

# call the animator:  blit=True means only re-draw the parts that have changed.
anim = animation.FuncAnimation(fig, animate, init_func=init,
                               frames=200, interval=20, blit=True)
#plt.show()  # uncomment to watch
anim.save('wave.mp4', fps=30)

Python links

Learn Python: https://pythonbasics.org/
Python Tutorial: https://pythonprogramminglanguage.com