将多个条形图子图堆叠到一个PDF中(python，matplotlib)

pip install matplotlib

import matplotlib.pyplot as plt

# 定义数据
categories = ['A', 'B', 'C', 'D']
values1 = [10, 15, 7, 12]
values2 = [8, 11, 9, 6]
values3 = [5, 9, 14, 11]

# 创建子图
fig, ax = plt.subplots()

# 绘制条形图
ax.bar(categories, values1, label='Value 1')
ax.bar(categories, values2, bottom=values1, label='Value 2')
ax.bar(categories, values3, bottom=[i+j for i,j in zip(values1, values2)], label='Value 3')

# 添加图例
ax.legend()

# 设置标题和标签
ax.set_title('Stacked Bar Chart')
ax.set_xlabel('Categories')
ax.set_ylabel('Values')

# 保存图像为PDF文件
plt.savefig('stacked_bar_chart.pdf')