如何为散点图放置单个标签

问题描述

我正在尝试在matplotlib中绘制散点图，但找不到找到将标记添加到点的方法.例如:

I am trying to do a scatter plot in matplotlib and I couldn't find a way to add tags to the points. For example:

scatter1=plt.scatter(data1["x"], data1["y"], marker="o",
                     c="blue",
                     facecolors="white",
                     edgecolors="blue")

我希望"y"中的点具有标签，例如"point 1"，"point 2"等.我无法弄清楚.

I want for the points in "y" to have labels as "point 1", "point 2", etc. I couldn't figure it out.

推荐答案

也许使用 plt.annotate :

import numpy as np
import matplotlib.pyplot as plt

N = 10
data = np.random.random((N, 4))
labels = ['point{0}'.format(i) for i in range(N)]

plt.subplots_adjust(bottom = 0.1)
plt.scatter(
    data[:, 0], data[:, 1], marker='o', c=data[:, 2], s=data[:, 3] * 1500,
    cmap=plt.get_cmap('Spectral'))

for label, x, y in zip(labels, data[:, 0], data[:, 1]):
    plt.annotate(
        label,
        xy=(x, y), xytext=(-20, 20),
        textcoords='offset points', ha='right', va='bottom',
        bbox=dict(boxstyle='round,pad=0.5', fc='yellow', alpha=0.5),
        arrowprops=dict(arrowstyle = '->', connectionstyle='arc3,rad=0'))

plt.show()

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