Python 使用 Matplotlib 绘制时间戳（小时/分钟/秒）
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Plotting timestamps (hour/minute/seconds) with Matplotlib
提问by user1048858
I want to plot some timestamps (Year-month-day Hour-Minute-Second format). I am using the following code, however it doesn't show any hour-minute-second information, it shows them as 00-00-00. I double checked my date array, and as you can see from the snippet below, they are not zero.
我想绘制一些时间戳（年-月-日时-分-秒格式）。我正在使用以下代码，但是它没有显示任何时-分-秒信息，而是将它们显示为 00-00-00。我仔细检查了我的日期数组，正如您从下面的代码段中看到的，它们不为零。
Do you have any idea about why I am getting 00-00-00's?
你知道我为什么会收到 00-00-00 吗？
import matplotlib.pyplot as plt
import matplotlib.dates as md
import dateutil
dates = [dateutil.parser.parse(s) for s in datestrings]
# datestrings = ['2012-02-21 11:28:17.980000', '2012-02-21 12:15:32.453000', '2012-02-21 23:26:23.734000', '2012-02-26 17:42:15.804000']
plt.subplots_adjust(bottom=0.2)
plt.xticks( rotation= 80 )
ax=plt.gca()
xfmt = md.DateFormatter('%Y-%m-%d %H:%M:%S')
ax.xaxis.set_major_formatter(xfmt)
plt.plot(dates[0:10],plt_data[0:10], "o-")
plt.show()
采纳答案by seth
Try zooming in on your graph, you will see the datetimes expand as your x axis scale changes.
尝试放大图形，您会看到日期时间随着 x 轴比例的变化而扩展。
plotting unix timestamps in matplotlib
I had a similarly annoying problem when trying to plot heatmaps of positive selection on chromosomes. If I zoomed out too far things would disappear entirely!
在尝试绘制染色体上正选择的热图时，我遇到了类似的烦人问题。如果我缩小得太远，事情就会完全消失！
edit: This code plots your dates exactly as you give them, but doesn't add ticks in between.
编辑：此代码完全按照您提供的日期绘制您的日期，但不会在两者之间添加刻度。
import matplotlib.pyplot as plt
import matplotlib.dates as md
import dateutil
datestrings = ['2012-02-21 11:28:17.980000', '2012-02-21 12:15:32.453000', '2012-02-21 23:26:23.734000', '2012-02-26 17:42:15.804000']
dates = [dateutil.parser.parse(s) for s in datestrings]
plt_data = range(5,9)
plt.subplots_adjust(bottom=0.2)
plt.xticks( rotation=25 )
ax=plt.gca()
ax.set_xticks(dates)
xfmt = md.DateFormatter('%Y-%m-%d %H:%M:%S')
ax.xaxis.set_major_formatter(xfmt)
plt.plot(dates,plt_data, "o-")
plt.show()
回答by mintchip36
I can tell you why it shows the 00:00:00. It's because that's the start time of that particular day. For example, one tick is at 2012-02-22 00:00:00 (12 midnight of 2012-02-22) and another is at 2012-02-23 00:00:00 (12 midnight of 2012-02-23).
我可以告诉你为什么它显示 00:00:00。因为那是那一天的开始时间。例如，一个刻度是在 2012-02-22 00:00:00（2012-02-22 午夜 12 点），另一个是在 2012-02-23 00:00:00（2012-02-23 午夜 12 点） ）。
Ticks for the timestamps in between these two times are not shown.
未显示这两个时间之间的时间戳记。
I myself am trying to figure out how to show ticks for in between these times.
我自己正试图弄清楚如何在这些时间之间显示刻度。
