在Matplotlib上绘制每个单独列中的元素

import matplotlib.pyplot as plt
import numpy as np

data = np.array([[1, 2, 3], [4, 5, 6], [7, 8, 9]])

x = np.arange(data.shape[1])  # x轴坐标
width = 0.2  # 柱状图宽度

fig, ax = plt.subplots()
for i in range(data.shape[0]):
    ax.bar(x + i * width, data[i], width, label='Column {}'.format(i+1))

ax.set_xlabel('Columns')
ax.set_ylabel('Values')
ax.set_title('Bar Chart of Each Column')
ax.set_xticks(x + width * (data.shape[0] - 1) / 2)
ax.set_xticklabels(['Column {}'.format(i+1) for i in range(data.shape[1])])
ax.legend()

plt.show()