matplotlib HourLocator 窃取我的 x 标签 [英] matplotlib HourLocator steals my x labels

问题描述

当我绘制半小时的时间序列时，我的轴标签是奇怪的(例如大约16:33:12h ...)当我使用HourLocator修复此问题(16:33h-> 16:00h)时，我的x标签完全消失了.

When I plot my half hourly time series, my axis labels are odd (like 16:33:12h or so...) When I use HourLocator to fix this (16:33h -> 16:00h), then my x label disappear completely.

我的代码是:

from datetime import date, timedelta, datetime, time
from matplotlib.dates import DayLocator, HourLocator
import matplotlib.pyplot as plt

start = time(0, 0, 0)
delta = timedelta(minutes=30)
times = []

for i in range(len(day_load)):
    dt = datetime.combine(date.today(), time(0, 0)) + delta * i
    times.append(dt.time())

load = [i/48 for i in range(48)]

fig, ax = plt.subplots()
ax.plot_date(times, load)
ax.xaxis.set_major_locator(HourLocator())
plt.show()

如何获得偶数"标签(以最佳实践方式-我不想为其他所有图再次重写代码).当我评论倒数第二行时，我得到正常的奇数"标签:(

How can I achieve "even" labels (in a best practice way - I don't want to rewrite code for every other plot again). When I comment second last line, I get normal "odd" labels :(

感谢您的回答！

推荐答案

有两个主要问题:

• 您需要处理完整的日期时间对象，而不仅仅是时间.因此，您应该直接添加 dt 而不是 dt.time().
• 您不仅需要一个定位器，而且还需要一个格式化程序来生成漂亮的刻度标签.在这里，您可以使用 DateFormatter("%H:%M") 来显示小时和分钟.

• You need to work with complete datetime objects, not only with time. So instead of dt.time() you should append dt directly.
• You not only need a locator, but also a formatter to produce nice ticklabels. Here you may use a DateFormatter("%H:%M") to show hours and minutes.

完整代码:

from datetime import date, timedelta, datetime, time
from matplotlib.dates import DayLocator, HourLocator,DateFormatter
import matplotlib.pyplot as plt

start = time(0, 0, 0)
delta = timedelta(minutes=30)
times = []
n=48

for i in range(n):
    # use complete datetime object, not only time
    dt = datetime.combine(date.today(), time(0, 0)) + delta * i
    times.append(dt)

load = [i/float(n) for i in range(n)]

fig, ax = plt.subplots()
ax.plot_date(times, load)

# set a locator, as well as a formatter
ax.xaxis.set_major_locator(HourLocator())
ax.xaxis.set_major_formatter(DateFormatter("%H:%M"))

#optionally rotate the labels and make more space for them
fig.autofmt_xdate()
plt.show()

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