如何在 matplotlib 中绘制特定日期的垂直线

发布于 2025-01-12 23:25:03 字数 354 浏览 0 评论 0原文

如何在特定日期向此图表添加垂直线标记？ 周末 是日期列。

fig, ax = plt.subplots(figsize=(20,9))
thirteen.plot.line(x='Week end', y='OFF', color='crimson', ax=ax)
thirteen.plot.line(x='Week end', y='ON', color='blue', ax=ax)
ax.set_ylim(bottom=0)
plt.show()

原文

How could I add a vertical line marker to this chart at a specific date? Week end is the date column.

fig, ax = plt.subplots(figsize=(20,9))
thirteen.plot.line(x='Week end', y='OFF', color='crimson', ax=ax)
thirteen.plot.line(x='Week end', y='ON', color='blue', ax=ax)
ax.set_ylim(bottom=0)
plt.show()

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在风中等你 2025-01-19 23:25:03

首先确保日期列周末已转换to_datetime。

然后使用 axvline或 vlines：

axvline一次只能绘制一条垂直线，并且会自动填充整个y范围
vlines 可以绘制多条垂直线立即，但您必须指定 y 边界

# convert to datetime date type
thirteen['Week end'] = pd.to_datetime(thirteen['Week end'])

fig, ax = plt.subplots(figsize=(20, 9))
thirteen.plot.line(x='Week end', y='OFF', color='crimson', ax=ax)
thirteen.plot.line(x='Week end', y='ON', color='blue', ax=ax)

# plot vertical line at one date
ax.axvline(x='2013-07-01', color='k')

# plot vertical lines at two dates from y=0 to y=250
ax.vlines(x=['2013-11-01', '2014-04-15'], ymin=0, ymax=250, color='k', ls='--')

First make sure the date column Week end has been converted to_datetime.

Then use either axvline or vlines:

axvline can only plot one vertical line at a time and will automatically fill the whole y range
vlines can plot multiple vertical lines at once, but you have to specify the y bounds

# convert to datetime date type
thirteen['Week end'] = pd.to_datetime(thirteen['Week end'])

fig, ax = plt.subplots(figsize=(20, 9))
thirteen.plot.line(x='Week end', y='OFF', color='crimson', ax=ax)
thirteen.plot.line(x='Week end', y='ON', color='blue', ax=ax)

# plot vertical line at one date
ax.axvline(x='2013-07-01', color='k')

# plot vertical lines at two dates from y=0 to y=250
ax.vlines(x=['2013-11-01', '2014-04-15'], ymin=0, ymax=250, color='k', ls='--')

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