python画时间序列散点图
# -*- coding: utf-8 -*- """speed1219.csv data file format:
dtime,speed
2017-12-19 10:33:30,803
2017-12-19 10:35:29,1008
2017-12-19 10:36:04,1016
2017-12-19 10:37:32,984
2017-12-19 10:38:06,1008
"""
import pandas as pd
import matplotlib.pyplot as plt
from matplotlib.dates import AutoDateLocator, DateFormatter
df = pd.read_csv('d:/speed1219.csv',parse_dates=['dtime'])
plt.plot_date(df.dtime, df.speed, fmt='b.')
ax = plt.gca()
ax.xaxis.set_major_formatter(DateFormatter('%Y-%m-%d %H:%M'))#设置时间显示格式
ax.xaxis.set_major_locator(AutoDateLocator(maxticks=24)) #设置时间间隔
plt.xticks(rotation=90, ha='center')
label = ['speedpoint']
plt.legend(label, loc='upper right')
plt.grid()
ax.set_title(u'传输速度', fontproperties='SimHei',fontsize=14)
ax.set_xlabel('dtime')
ax.set_ylabel('Speed(KB/s)')
plt.show()
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