在matplotlib中将x轴绘制为日期 [英] plot x-axis as date in matplotlib
问题描述
我正在尝试对数据进行一些分析.我得到了csv文件,并将其转换为pandas数据框.数据看起来像这样.它有几列,但我试图将x轴绘制为日期列. .
I am trying to perform some analysis on data. I got csv file and I convert it into pandas dataframe. the data looks like this. Its has several columns, but I am trying to draw x-axis as date column. .
熊猫数据框如下
print (df.head(10)
cus-id date value_limit
0 10173 2011-06-12 455
1 95062 2011-09-11 455
2 171081 2011-07-05 212
3 122867 2011-08-18 123
4 107186 2011-11-23 334
5 171085 2011-09-02 376
6 169767 2011-07-03 34
7 80170 2011-03-23 34
8 154178 2011-10-02 34
9 3494 2011-01-01 34
我正在尝试绘制日期数据,因为同一日期有多个值.为此,我试图将x-asis刻度绘制为日期.由于日期"列中的最小日期为2011-01-01,最大日期为2012-04-20.
I am trying to plot date data because there are multiple values for same date. for this purpose I am trying to plot x-asis ticks as date. since the minimum date in date column is 2011-01-01 and maximum date is 2012-04-20.
我尝试过类似的事情
import pandas as pd
import numpy as np
import matplotlib.pyplot as plt
import datetime
import matplotlib.dates as mdates
df = pd.read_csv('rio_data.csv', delimiter=',')
print (df.head(10))
d = []
for dat in df.date:
# print (dat)
d.append(datetime.strptime(df['date'], '%Y-%m-%d'))
days = dates.DayLocator()
datemin = datetime(2011, 1, 1)
datemax = datetime(2012, 4, 20)
fig = plt.figure()
ax = fig.add_subplot(111)
ax.xaxis.set_major_locator(days)
ax.set_xlim(datemin, datemax)
ax.set_ylabel('Count values')
但是我收到此错误.
AttributeError: 'DataFrame' object has no attribute 'date'
我正在尝试将日期绘制为x轴,它应该看起来像这样.
I am trying to draw date as x-axis, it should look like this.
有人可以帮我绘制x轴作为日期列吗?我会很感激.
Can someone help me to draw the x-axis as date column. I would be grateful.
推荐答案
将索引设置为日期时间序列
如果将索引设置为日期时间序列,则matplotlib将为您处理x轴.这是您如何处理此可视化效果的最小示例.
Set the index to the datetime series
If you set the index to the datetime series matplotlib will handle the x axis for you. Here is a minimal example of how you might deal with this visualization.
import pandas as pd
import matplotlib.pyplot as plt
date_time = ["2011-09-01", "2011-08-01", "2011-07-01", "2011-06-01", "2011-05-01"]
date_time = pd.to_datetime(date_time)
temp = [2, 4, 6, 4, 6]
DF = pd.DataFrame()
DF['temp'] = temp
DF = DF.set_index(date_time)
fig, ax = plt.subplots()
fig.subplots_adjust(bottom=0.3)
plt.xticks(rotation=90)
plt.plot(DF)
这将产生一个如下图所示的图:
重要的一点是,将DataFrame索引设置为datetime序列可以使matplotlib在时间序列数据上处理x轴而无需太多帮助.
The important note is that setting the DataFrame index to the datetime series allows matplotlib to deal with x axis on time series data without much help.
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