以直方图绘制平均线(matplotlib) [英] Drawing average line in histogram (matplotlib)

问题描述

我正在使用python中的matplotlib绘制直方图，并想绘制一条表示数据集平均值的线，以虚线覆盖在直方图上(或者也可以使用其他颜色).关于如何绘制直方图上的线的任何想法?

I am drawing a histogram using matplotlib in python, and would like to draw a line representing the average of the dataset, overlaid on the histogram as a dotted line (or maybe some other color would do too). Any ideas on how to draw a line overlaid on the histogram?

我正在使用plot()命令，但不确定如何绘制垂直线(即，我应为y轴赋予什么值?

I am using the plot() command, but not sure how to draw a vertical line (i.e. what value should I give for the y-axis?

谢谢！

推荐答案

您可以使用plot或vlines绘制一条垂直线，但是要从y轴的底部到顶部绘制一条垂直线， axvline可能是最简单的函数.这是一个示例:

You can use plot or vlines to draw a vertical line, but to draw a vertical line from the bottom to the top of the y axis, axvline is the probably the simplest function to use. Here's an example:

In [80]: import numpy as np

In [81]: import matplotlib.pyplot as plt

In [82]: np.random.seed(6789)

In [83]: x = np.random.gamma(4, 0.5, 1000)

In [84]: result = plt.hist(x, bins=20, color='c', edgecolor='k', alpha=0.65)

In [85]: plt.axvline(x.mean(), color='k', linestyle='dashed', linewidth=1)
Out[85]: <matplotlib.lines.Line2D at 0x119758828>

结果:

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