Why is my graphs incorrect?

[DanjieTang]

import matplotlib.pyplot as plt
import numpy as np

Creating some data

x = np.linspace(0, 10, 100)
y = np.cos(x)
z = np.sin(x)
data = np.random.normal(0, 1, 1000)

Setting up the layout of the plots

fig, ax = plt.subplots(2, 2, figsize=(10, 10)) # 2x2 grid of subplots

Line plot

ax[0, 0].plot(x, y, label='sin(x)')
ax[0, 0].plot(x, z, label='cos(x)', linestyle='--')
ax[0, 0].set_title('Line Plot')
ax[0, 0].set_xlabel('x')
ax[0, 0].set_ylabel('f(x)')
ax[0, 0].legend()

Scatter plot

ax[0, 1].scatter(x, y, color='red')
ax[0, 1].set_title('Scatter Plot')
ax[0, 1].set_xlabel('x')
ax[0, 1].set_ylabel('sin(x)')

Histogram

ax[1, 0].hist(data, bins=30, color='green', alpha=0.7)
ax[1, 0].set_title('Histogram')
ax[1, 0].set_xlabel('Value')
ax[1, 0].set_ylabel('Frequency')

Pie chart

sizes = [25, 25, 25, 25]
labels = ['North', 'South', 'East', 'West']
ax[1, 1].pie(sizes, labels=labels, autopct='%1.1f%%', startangle=90)
ax[1, 1].set_title('Pie Chart')
ax[1, 1].axis('equal') # Equal aspect ratio ensures that pie is drawn as a circle.

plt.tight_layout()
plt.show()