R:如何为两个不同的组绘制并排错误条形图

import matplotlib.pyplot as plt
import numpy as np

# 示例数据
group1_mean = [20, 34, 30, 35, 27]
group1_std = [2, 3, 4, 1, 2]
group2_mean = [25, 32, 34, 20, 25]
group2_std = [3, 5, 2, 3, 3]

# 设置条形图的位置和宽度
bar_width = 0.35
index = np.arange(len(group1_mean))

# 绘制错误条形图
plt.bar(index, group1_mean, bar_width, yerr=group1_std, label='Group 1')
plt.bar(index + bar_width, group2_mean, bar_width, yerr=group2_std, label='Group 2')

# 添加标题和标签
plt.xlabel('Categories')
plt.ylabel('Values')
plt.title('Error Bar Chart for Two Groups')
plt.xticks(index + bar_width / 2, ('A', 'B', 'C', 'D', 'E'))
plt.legend()

# 显示图表
plt.tight_layout()
plt.show()