x轴标签在DataFrame图上显示日期的频率增加 [英] Increasing Frequency of x-axis labels for dates on DataFrame plot
问题描述
我有一个带有两列的pandas DataFrame:month_of_sale
是日期,而number_of_gizmos_sold
是数字.
I have a pandas DataFrame with two columns: month_of_sale
which is a date, and number_of_gizmos_sold
which is a number.
我正在尝试增加x轴上标签的频率,以便于阅读,但我做不到!
I'm trying to increase the frequency of the labels on the x-axis so it's easier to read, but I can't!
这是我的桌子的df.head()
:
,它是这样绘制的:
df.plot(y='number_of_gizmos_sold', figsize=(15,5))
and this is what it plots:
df.plot(y='number_of_gizmos_sold', figsize=(15,5))
我想增加标签的频率,因为它们之间有很大的空间.
I'd like to increase the frequency of the labels, because there's a big space in between them.
plot.xaxis.set_major_locator(MonthLocator())
,但这似乎进一步增加了标签之间的距离.
plot.xaxis.set_major_locator(MonthLocator())
but that seems to increase the distance between the labels even more.
plot.xaxis.set_major_formatter(DateFormatter('%Y-%m-%d'))
奇怪的是,我最终得到了这个:
Strangely, I end up with this:
最后一个情节给我提出的问题是:
The questions that last plot raises for me are:
- 那一年的0002是什么?
- 那为什么我仍然还有旧的
Jul
标签?
- What's up with 0002 as the year?
- And why do I still have the old
Jul
labels there too?
推荐答案
我尚未将问题追溯到其根源,但根据 bmu的
解决方案,如果您致电ax.plot
而不是df.plot
,则可以使用以下命令配置结果
ax.xaxis.set_major_locator
和ax.xaxis.set_major_formatter
.
I haven't traced the problem back to its source, but per bmu's
solution, if you call ax.plot
instead of df.plot
, then you can configure the result using
ax.xaxis.set_major_locator
and ax.xaxis.set_major_formatter
.
import numpy as np
import pandas as pd
import matplotlib.pyplot as plt
import matplotlib.dates as mdates
np.random.seed(2016)
dates = pd.date_range('2013-03-01', '2016-02-01', freq='M')
nums = (np.random.random(len(dates))-0.5).cumsum()
df = pd.DataFrame({'months': dates, 'gizmos': nums})
df['months'] = pd.to_datetime(df['months'])
df = df.set_index('months')
fig, ax = plt.subplots()
ax.plot(df.index, df['gizmos'])
# df.plot(y='gizmos', ax=ax)
ax.xaxis.set_major_locator(mdates.MonthLocator(interval=2))
ax.xaxis.set_major_formatter(mdates.DateFormatter('%Y-%m-%d'))
fig.autofmt_xdate()
plt.show()
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