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问题：matplotlib图例标记仅一次
回答 0
回答 1

问题：matplotlib图例标记仅一次

我经常使用以下命令在matplotlib图上绘制点：

x = 10
y = 100
plot(x, y, "k*", label="Global Optimum")
legend()

但是，这会导致图例两次在图例中放置一颗星星，如下所示：

* * Global Optimum

当我真的希望它看起来像：

 *  Global Optimum

我该怎么做呢？

点击查看英文原文

I often plot a point on a matplotlib plot with:

x = 10
y = 100
plot(x, y, "k*", label="Global Optimum")
legend()

However, this causes the legend to put a star in the legend twice, such that it looks like:

* * Global Optimum

when I really want it to look like:

 *  Global Optimum

How do I do this?

回答 0

这应该工作：

legend(numpoints=1)

顺便说一句，如果您添加行

legend.numpoints     : 1      # the number of points in the legend line

到您的matplotlibrc文件，那么这将是新的默认设置。

[另请参见散点图，具体取决于您的情节。]

API：链接到API文档

点击查看英文原文

This should work:

legend(numpoints=1)

BTW, if you add the line

legend.numpoints     : 1      # the number of points in the legend line

to your matplotlibrc file, then this will be the new default.

[See also scatterpoints, depending on your plot.]

API: Link to API docs

回答 1

我喜欢在每个python脚本中动态更改matplotlib rc参数。为了实现这个目标，我只是在python文件的开头使用了类似的东西。

from pylab import *
rcParams['legend.numpoints'] = 1

这将适用于从我的python文件生成的所有图。

编辑：对于那些谁不喜欢导入pylab，长答案是

import matplotlib as mpl
mpl.rcParams['legend.numpoints'] = 1
点击查看英文原文

I like to change my matplotlib rc parameters dynamically in every python script. To achieve this goal I simply use somthing like that at the beginning of my python files.

from pylab import *
rcParams['legend.numpoints'] = 1

This will apply to all plots generated from my python file.

EDIT: For those who do not like to import pylab, the long answer is

import matplotlib as mpl
mpl.rcParams['legend.numpoints'] = 1
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