plt.plot(x[0:-1],y/y[0]) 是什么意思？

Question

I am plotting an exponential distribution using the information provided by the tutor.

plt.plot(x[:-1],y/y[0])
plt.plot(tvals,pvals)
plt.show()

But, I do not know what's meaning of x[:-1] and y/y[0]?

Answer 1

x[:-1] means all the elements except the last one

y/y[0] is simply dividing the array y by the first value ie y[0] of the array.

Code Example

import numpy as np
import matplotlib.pyplot as plt

x = np.array([1, 3, 5, 7])
y = np.array([2, 4, 6])

a = x[:-1]  # [1, 3, 5]
b = y/y[0]  # [1, 2, 3]

plt.plot(a, b)

Output