[plotstyle] new sketch_style(), plain_style() and plot_style()

regression/lecture/derivative.py

@@ -2,6 +2,8 @@ import numpy as np
 import matplotlib.pyplot as plt
 from plotstyle import *
 
+plain_style()
+
 fig = plt.figure( figsize=(2.5,3.4) )
 ax = fig.add_subplot(1, 1, 1)
 

regression/lecture/gradient.py

@@ -2,6 +2,8 @@ import numpy as np
 import matplotlib.pyplot as plt
 from plotstyle import *
 
+plain_style()
+
 fig, ax = plt.subplots( figsize=(3.5,3.7) )
 fig.subplots_adjust(**adjust_fs(fig, 4.0, 1.0, 2.8, 0.5))