Python 3.x Groupby之后一个元素与所有其他元素的差异
我有一个如下所示的数据集:Python 3.x Groupby之后一个元素与所有其他元素的差异,python-3.x,pandas,pandas-groupby,Python 3.x,Pandas,Pandas Groupby,我有一个如下所示的数据集: Date Lon_s lat_s HLON_cv HLAT_cv 1853-11-09 31 -10.4 293.85 5.2 1853-11-09 302.3 3.6 290.15 4.9 1853-12-01 85.5 -7.5 84.62 -6.88 1853-12-01 85.5 -7.5 78.2 -6.83 1853-12-01 88 -8.6 84.62 -6.88 1853-12-01 88 -8.6 78.2 -6.83 1853-12-01 86
Date Lon_s lat_s HLON_cv HLAT_cv
1853-11-09 31 -10.4 293.85 5.2
1853-11-09 302.3 3.6 290.15 4.9
1853-12-01 85.5 -7.5 84.62 -6.88
1853-12-01 85.5 -7.5 78.2 -6.83
1853-12-01 88 -8.6 84.62 -6.88
1853-12-01 88 -8.6 78.2 -6.83
1853-12-01 86.6 -7.8 84.62 -6.88
1853-12-01 86.6-7.8 78.2-6.83定义以下函数(其中包含另一个函数):
它生成由两列组成的数据帧:Lon_diff和Lat_diff,
各有不同
然后将此函数的应用结果连接到原始数据帧:
result = df.join(df.groupby('Date').apply(myFun))
结果是:
Date Lon_s Lat_s HLON_cv HLAT_cv Lon_diff Lat_diff
0 1853-11-09 31.0 -10.4 293.85 5.20 -262.85 -15.60
1 1853-11-09 302.3 3.6 290.15 4.90 -259.15 -15.30
2 1853-12-01 85.5 -7.5 84.62 -6.88 0.88 -0.62
3 1853-12-01 85.5 -7.5 78.20 -6.83 7.30 -0.67
4 1853-12-01 88.0 -8.6 84.62 -6.88 0.88 -0.62
5 1853-12-01 88.0 -8.6 78.20 -6.83 7.30 -0.67
6 1853-12-01 86.6 -7.8 84.62 -6.88 0.88 -0.62
7 1853-12-01 86.6 -7.8 78.20 -6.83 7.30 -0.67
请尝试以下代码,并让我知道它是否有效:
diff_df = pd.DataFrame()
for group, values in df.groupby(df['Date']):
lat_diff = []; lon_diff = []
for i in range(len(values['Lon_s'])):
for j in range(len(values['HLON_cv']):
lon_diff.append(values['Lon_s'].iloc[i] - values['HLON_cv'].iloc[j])
for m in range(len(values['Lat_s'])):
for n in range(len(values['HLAT_cv']):
lat_diff.append(values['Lat_s'].iloc[m] - values['HLAT_cv'].iloc[n])
df = pd.DataFrame({"date": group, "Lat_Diff": lat_diff, "Long_Diff":lon_diff})
diff_df = diff_df.append(df)
这将以以下格式为您创建一个数据帧:
Date Lon_diff Lat_diff
0 1853-11-09 -262.85 -15.60
1 1853-11-09 -259.15 -15.30
2 1853-12-01 0.88 -0.62
3 1853-12-01 7.30 -0.67
4 1853-12-01 0.88 -0.62
5 1853-12-01 7.30 -0.67
6 1853-12-01 0.88 -0.62
7 1853-12-01 7.30 -0.67
Date Lon_diff Lat_diff
0 1853-11-09 -262.85 -15.60
1 1853-11-09 -259.15 -15.30
2 1853-12-01 0.88 -0.62
3 1853-12-01 7.30 -0.67
4 1853-12-01 0.88 -0.62
5 1853-12-01 7.30 -0.67
6 1853-12-01 0.88 -0.62
7 1853-12-01 7.30 -0.67