image.png
import matplotlib.pyplot as plt
import numpy as np
x = np.linspace(-3, 3, 50)
y = 2*x + 1
plt.figure(num=1, figsize=(8,5),)
plt.plot(x, y,)
ax = plt.gca()
ax.spines['right'].set_color('none')
ax.spines['top'].set_color('none')
ax.xaxis.set_ticks_position('bottom')
ax.spines['bottom'].set_position(('data', 0))
ax.yaxis.set_ticks_position('left')
ax.spines['left'].set_position(('data', 0))
x0 = 1
y0 = 2*x0 + 1
plt.scatter(x0, y0, s=50, color='b')
plt.plot([x0, x0], [y0,0], 'k--', lw=2.5)
# method 1
plt.annotate(
r'$2x+1=%s$' % y0,
xy=(x0, y0),
xycoords='data',
xytext=(+30, -30),
textcoords='offset points',
fontsize=16,
arrowprops=dict(arrowstyle='->',
connectionstyle='arc3, rad=.2'))
# method 2
plt.text(
-3.7,
3,
r'$This\ is\ the\ some\ text.\ \mu\ \sigma_i\ \alpha_t$',
fontdict={'size':16, 'color':'r'}
)
plt.show()
