plot_date函数为小时数据设置xticks [英] plot_date function set xticks for hourly data

问题描述

我目前有一个功能，可以根据MM-DD-YYYY HH-MM格式的时间/日期数据创建时间序列图.我不确定如何更改x轴刻度，以便它显示小时以及日期，因为它当前仅显示日期.

I currently have a function that creates a time series graph from time/date data that is in MM-DD-YYYY HH-MM format. I am unsure as to how to change the x axis ticks such that it displays hours as well as the date as it currently only shows dates.

即使我已指定hour_locator且数据为每小时，但我包含的set_major_locator行仅返回具有年份的刻度线.

The set_major_locator line I included only returns ticks that have the year even though I have specified the hour_locator and the data is hourly.

def graph(region):

    fig = plt.figure(num=None, figsize=(60, 20), dpi=100, facecolor='w', edgecolor='k')

    df_da_region = df_da_abv_09[df_da_abv_09['Settlement Point'] == region]
    df_rt_region = df_rt_abv_09[df_rt_abv_09['Settlement Point Name'] == region]

    fig = plt.plot_date(x=list(df_da_region['DateTime']), y=list(df_da_region['Settlement Point Price']), xdate = True, fmt="r-", linewidth=0.7)
    fig = plt.plot_date(x=list(df_rt_region['DateTime']), y=list(df_rt_region['Settlement Point Price']), xdate = True, fmt="g-", alpha=0.5, linewidth=0.7)

    fig = plt.gca().xaxis.set_major_locator(mdates.HourLocator(interval=5))
    plt.show()

推荐答案

使用 matplotlib.dates.DateFormatter .首先将其导入顶部

Use matplotlib.dates.DateFormatter. First import it at the top

import matplotlib.dates as mdates

然后替换此行

fig = plt.gca().xaxis.set_major_locator(mdates.HourLocator(interval = 5))

通过这样的东西

myFmt = mdates.DateFormatter('%y-%m-%d %H') # here you can format your datetick labels as desired
plt.gca().xaxis.set_major_formatter(myFmt)

在一个带有随机数的示例中(因为您没有提供示例数据)，看起来像这样

In a example with random numbers (since you haven't provided sample data), it looks like this

在这里，可以根据需要选择格式化程序:日期+小时.有关如何在轴上设置日期格式的更多信息，请检查

Here, the formatter is chosen as you wanted: dates + hours. For further info about how to format the date on the axis, check here

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