效果展示
效果展示
import matplotlib.pyplot as plt
import numpy as np
#figure就是一個(gè)大窗口
x = np.linspace(-3,3,50)
y1 = 2*x+1
y2 = x**2
plt.figure()
plt.plot(x,y2)
#figure plot第二條線,紅色虛線
plt.plot(x,y1,color='red',linewidth=1.0,linestyle='--')
#x limit和y limit
plt.xlim((-1,2))
plt.ylim((-2,3))
plt.xlabel('I am x')
plt.ylabel('I am y')
#設(shè)置坐標(biāo)軸的單位小標(biāo)
# new_ticks = np.linspace(-1,2,5)
# plt.xticks(new_ticks)
#坐標(biāo)軸小標(biāo)換成文字
plt.yticks([-2,-1.8,-1,1.23,3],['really bad','bad','normal','good','really good'])
#gca = 'get current axis'
ax = plt.gca()
#把上面和右面的軸設(shè)置為消失
ax.spines['right'].set_color('none')
ax.spines['top'].set_color('none')
#設(shè)置下面的線為x軸，左邊的線為y軸
ax.xaxis.set_ticks_position('bottom')
ax.yaxis.set_ticks_position('left')
#x軸的position放在y軸的0點(diǎn)上
ax.spines['bottom'].set_position(('data',-0))# outward,axes
ax.spines['left'].set_position(('data',0))
plt.legend(loc='lower right')
plt.show()
legend() loc屬性取值
image.png
