Matplotlib does not see the effect of setting edgecolor to plt.savefig () or plt.figure ()

Question

I can’t figure out how to add a border around the figure, I understand that it will be the parameter figure.edgecolor or savefig (edgecolor), but this does not work. I am using matplotlib 1.1.1. I would expect this code to draw a red border around the shape:

import matplotlib.pyplot as plt plt.plot([1,2,3]) plt.savefig('test.png', edgecolor='r', facecolor='g') 

When I look at the drawing, it has a green complexion, but I do not see the red edgecolor?

The following does not work either:

 import matplotlib.pyplot as plt plt.figure(edgecolor='r', facecolor='g') plt.plot([1,2,3]) plt.show() 

Again I see a green complexion, but without a red edgecolor. What am I doing wrong?

Any ideas?

Answer 1

According to the documentation matplotlib.figure.Figure() the linewidth edge size is set to 0.0 by default. You can visualize edgecolor if you increase this value in any of the code snippets:

 import matplotlib.pyplot as plt plt.figure(linewidth=2) plt.plot([1,2,3]) plt.savefig('test.png', edgecolor='r', facecolor='g') 

Or:

 import matplotlib.pyplot as plt plt.figure(edgecolor='r', facecolor='g', linewidth=2) plt.plot([1,2,3]) plt.show() 

linewidth=0.0 is a good default, but it should be better documented in matplotlib.pyplot.savefig () .