python各种知识汇总帖

画一条sinx曲线
# draw the sinx curve
import numpy as np
import matplotlib.pyplot as plt
x = np.linspace(-20, 20, 100)
y = np.sin(x)
plt.plot(x, y)
plt.show()

cos x 也来一条
# draw the cos x curve
import numpy as np
import matplotlib.pyplot as plt
x = np.linspace(-20, 20, 100)
y = np.cos(x)
plt.plot(x, y)
plt.show()

用numpy建个4行5列的矩阵
import numpy as np
x = np.arange(20).reshape(4,5)
print("x")

今天先不发了，有点累

欢迎提问哈。