python - 为什么 dataframe.plot 的错误栏不显示？

Question

这里我有一个数据框，我想绘制误差线图

import pandas as pd
import matplotlib.pyplot as plt

rows = ["N", "W", "E", "S"]
cols = ["x_mean","y_mean","x_se","y_se"]
data = ([50, 40, 2, 5], [30, 34, 3, 5], [60, 45, 8, 3], [80, 60, 5, 5])

df = pd.DataFrame(data, index = rows, columns = cols)

   x_mean  y_mean  x_se  y_se
N      50      40     2     5
W      30      34     3     5
E      60      45     8     3
S      80      60     5     5

# plot
df[["x_mean", "y_mean"]].plot(kind = "bar", yerr = df[["x_se", "y_se"]], rot = 1)

但是，错误栏没有出现，欢迎任何提示或帮助

• 这与在 pandas 中将误差线添加到分组条形图中的透视数据格式相同，因此不清楚为什么不显示误差线。

标签： pythonpandasmatplotlibbar-chart