170622 Save plot to image file instead of displaying it using Matplotlib

​​Issue description​​

Answer as following

Code

import matplotlib.pyplot as plt
import numpy as np
import matplotlib.cm as cm

for i in range(10):
    data = np.random.randint(1,99,(10,10))
    plt.ioff() # prevent showing the picture
    plt.matshow(data,cmap=cm.RdYlGn) # plot the picture
    plt.savefig('rms_map//'+str(i)+'.png')

Color Example
​​​https://matplotlib.org/examples/color/colormaps_reference.html​​​
Gitbook Resource
​​​https://www.gitbook.com/@wizardforcel​​