使用seaborn / matplotlib箱图时的刻度频率 [英] tick frequency when using seaborn/matplotlib boxplot
问题描述
我正在用seaborn绘制一系列的箱型图,
sns.boxplot(full_array)
其中 full_array
包含200个数组。
因此,我在0到200的x轴上有200个框线和刻度。
xticks彼此之间距离太近,我想仅显示其中一些,例如,每20个左右会显示一个标记的xtick。
我尝试了几种解决方案,如提到的
I am plotting with seaborn a series of boxplots with
sns.boxplot(full_array)
where full_array
contains 200 arrays.
Therefore, I have 200 boxplots and ticks on the x-axis from 0 to 200.
The xticks are too close to each other and I would like to show only some of them, for instance, a labeled xtick every 20, or so.
I tried several solutions as those mentioned here but they did not work.
Every time I sample the xticks, I get wrong labels for the ticks, as they get numbered from 0 to N, with unit spacing.
For instance, with the line ax.xaxis.set_major_locator(ticker.MultipleLocator(20))
I get a labelled xtick every 20 but the labels are 1, 2, 3, 4 instead of 20, 40, 60, 80...
Thanks to anyone who's so kind to help.
The seaborn boxplot uses a FixedLocator and a FixedFormatter, i.e.
print ax.xaxis.get_major_locator()
print ax.xaxis.get_major_formatter()
prints
<matplotlib.ticker.FixedLocator object at 0x000000001FE0D668>
<matplotlib.ticker.FixedFormatter object at 0x000000001FD67B00>
It's therefore not sufficient to set the locator to a MultipleLocator
since the ticks' values would still be set by the fixed formatter.
Instead you would want to set a ScalarFormatter
, which sets the ticklabels to correspond to the numbers at their position.
import matplotlib.pyplot as plt
import matplotlib.ticker as ticker
import seaborn.apionly as sns
import numpy as np
ax = sns.boxplot(data = np.random.rand(20,30))
ax.xaxis.set_major_locator(ticker.MultipleLocator(5))
ax.xaxis.set_major_formatter(ticker.ScalarFormatter())
plt.show()
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