python - python情节没有正确显示

Question

我有这段代码，预期的输出是（见第一张图），但实际输出是（见第二张图）。出了什么问题？

import numpy as np
import matplotlib.pyplot as plt

t = np.arange(-.75, 2.25, .001)

p = 1 / (np.cos(t) + np.sin(t))

plt.plot(p)

plt.axis((-1, 2.5, 0, 4))
plt.show()

Answer 1

This should fix it:

plt.plot(t, p)

What you were doing was plotting p against range(len(p)), essentially.