[英]pandas dataframe : seaborn plot bar with multiple columns and datetime as index
我有 dataframe 有兩列這樣的(以日期為索引):
我的目標是 plot 條與 seaborn 像這樣(使用 excel):
我關注了這里的討論:在此處輸入鏈接描述
我知道我必須使用融化。 但是當我輸入以下代碼時,結果是索引(日期)消失(由數字替換)並且 dataframe 結構更改如下:
# pd.melt(df, id_vars=['A'], value_vars=['B'])
premier_melt = pd.melt(final_mada_df,id_vars=["Confirmed"],value_vars = ["Recovered"])
我們如何才能正確解決 plot 條與 seaborn 的此類問題
提前致謝
我按照以下建議將代碼放在下面:
# main dataframe
df2
Recovered Confirmed
3/20/20 0 3
3/21/20 0 0
3/22/20 0 0
3/23/20 0 9
df2.stack()
出去:
3/20/20 Recovered 0
Confirmed 3
3/21/20 Recovered 0
Confirmed 0
3/22/20 Recovered 0
..
5/4/20 Confirmed 0
5/5/20 Recovered 2
Confirmed 2
5/6/20 Recovered 0
Confirmed 7
Length: 96, dtype: int64
df2.rename(columns={'level_1':'Status',0:'Values'})
出去:
Recovered Confirmed
3/20/20 0 3
3/21/20 0 0
3/22/20 0 0
3/23/20 0 9
3/24/20 0 5
但是當我輸入以下代碼時,出現錯誤:
# plot
ax = sns.barplot(x=df2.index,y='Values',data=df2,hue='Status')
ValueError: Could not interpret input 'Values'
import pandas as pd
import seaborn as sns
import numpy as np
from datetime import datetime
import matplotlib.pyplot as plt
# optional graph format parameters
plt.rcParams['figure.figsize'] = (16.0, 10.0)
plt.style.use('ggplot')
# data
np.random.seed(365)
data = {'Confirmed': [np.random.randint(10) for _ in range(25)],
'date': pd.bdate_range(datetime.today(), freq='d', periods=25).tolist()}
# dataframe
df = pd.DataFrame(data)
# add recovered
df['Recovered'] = df['Confirmed'].div(2)
| date | Confirmed | Recovered |
|:--------------------|------------:|------------:|
| 2020-05-12 00:00:00 | 4 | 2 |
| 2020-05-13 00:00:00 | 1 | 0.5 |
| 2020-05-14 00:00:00 | 5 | 2.5 |
| 2020-05-15 00:00:00 | 1 | 0.5 |
| 2020-05-16 00:00:00 | 9 | 4.5 |
# verify datetime format and set index
df.date = pd.to_datetime(df.date)
df.set_index('date', inplace=True)
.stack
df1 = df.stack().reset_index().set_index('date').rename(columns={'level_1': 'Status', 0: 'Values'})
.melt
df1 = df.melt(ignore_index=False, var_name='Status', value_name='Values')
Status Values
date
2022-06-24 Confirmed 2.0
2022-06-25 Confirmed 4.0
2022-06-26 Confirmed 1.0
2022-06-27 Confirmed 5.0
2022-06-28 Confirmed 2.0
df
而不是df1
。 如上所示,每個日期都重復,因此df1.index.to_series()
將生成一個包含重復日期的列表。ax = sns.barplot(x=df1.index, y='Values', data=df1, hue='Status')
# format the x-axis tick labels uses df, not df1
ax.xaxis.set_major_formatter(plt.FixedFormatter(df.index.to_series().dt.strftime("%Y-%m-%d")))
# alternative use the following to format the labels
# _, labels = plt.xticks()
# labels = [label.get_text()[:10] for label in labels]
# ax.xaxis.set_major_formatter(plt.FixedFormatter(labels))
plt.xticks(rotation=90)
plt.show()
df.plot.bar()
df1
df
有一個日期時間索引,它被識別為 x 軸,所有列都繪制在 y 軸上。ax = df.plot.bar()
ax.xaxis.set_major_formatter(plt.FixedFormatter(df.index.to_series().dt.strftime("%Y-%m-%d")))
plt.show()
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