Matplotlib绘制直线图

Code 1

import matplotlib.pyplot as plt

x = [3, 4]
y = [6, 9]

plt.plot(x, y, linewidth=6)

plt.show()

Code 2

import numpy as np

import matplotlib.pyplot as plt

x = np.linspace(-1, 1, 50)

y = 3*x + 10

plt.figure()

plt.plot(x, y)

plt.show()

Code 3

import numpy as np

import matplotlib.pyplot as plt

x = np.linspace(-3, 3, 50)

y1 = 3*x + 10

y2 = x**2

plt.figure()

plt.plot(x, y1)

plt.show()

plt.figure(num=4, figsize=(6, 8))

plt.plot(x, y2)

plt.plot(x, y1, color='red', linewidth='1.0', linestyle='--')

plt.show()

Code 4

import numpy as np

import matplotlib.pyplot as plt

# font_set = FontProperties(fname=r"C:/Windows/Fons/simsun.ttc", size=15)

x = np.linspace(-3, 3, 50)

y1 = 2*x + 1

y2 = x**2

plt.figure()

plt.plot(x, y1)

plt.show()

plt.figure(num=3, figsize=(8, 5))

plt.plot(x, y2)

plt.plot(x, y1, color='red', linewidth='1.0', linestyle='--')

plt.xlim((-1, 2))

plt.ylim((-2, 3))

new_ticks = np.linspace(-1, 2, 5)

print(new_ticks)

plt.xticks(new_ticks)

plt.yticks([-2, -1.8, -1, 1.22, 3, ], [r'really bad', r'bad', r'normal', r'good', r'really good'])

plt.show()