How to change the frequency of x ticks for time data?

Question

How can I change the frequency of my x ticks to every hour using matplotlib.pyplot? I looked at similar posts, but could not figure out how to apply their solutions to my data since I only have times, not full dates. Here’s an example of my data:

Time        SRH_1000m
14:03:00    318
14:08:00    321
14:13:00    261
14:17:00    312
14:22:00    285

Asked By: kjmw

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Source

Answer 1

See: https://matplotlib.org/stable/gallery/text_labels_and_annotations/date.html

import pandas as pd
import matplotlib.pyplot as plt
import matplotlib.dates as mdates

df = pd.DataFrame({'time': ['14:03:00', '14:07:00', '14:08:00', '14:15:00'], 'value': [0,1,2,3]})
df['time'] = pd.to_datetime(df['time'], format='%H:%M:%S')

fig = plt.figure()
ax = fig.add_subplot(1, 1, 1)

ax.plot(df['time'], df['value'])

ax.xaxis.set_major_locator(mdates.MinuteLocator(interval=5))
ax.xaxis.set_major_formatter(mdates.DateFormatter('%H:%M:%S'))

Answered By: J. Choi

How to change the frequency of x ticks for time data?

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