我有一个 .csv 文件,其中包含以下格式的城市、纬度和经度数据:
CITY|LATITUDE|LONGITUDE
A|40.745392|-73.978364
B|42.562786|-114.460503
C|37.227928|-77.401924
D|41.245708|-75.881241
E|41.308273|-72.927887
我需要创建以下格式的距离矩阵(请忽略虚拟值):
A B C D E
A 0.000000 6.000000 5.744563 6.082763 5.656854
B 6.000000 0.000000 6.082763 5.385165 5.477226
C 1.744563 6.082763 0.000000 6.000000 5.385165
D 6.082763 5.385165 6.000000 0.000000 5.385165
E 5.656854 5.477226 5.385165 5.385165 0.000000
我已将数据加载到 pandas 数据框中,并创建了一个交叉连接,如下所示:
import pandas as pd
df_A = pd.read_csv('lat_lon.csv', delimiter='|', encoding="utf-8-sig")
df_B = df_A
df_A['key'] = 1
df_B['key'] = 1
df_C = pd.merge(df_A, df_B, on='key')
- 你能帮我创建上面的矩阵结构吗?
- 另外,是否可以避免涉及交叉连接的步骤?
您可以使用pdist http://docs.scipy.org/doc/scipy/reference/generated/scipy.spatial.distance.pdist.html#scipy.spatial.distance.pdist and 正方形 http://docs.scipy.org/doc/scipy/reference/generated/scipy.spatial.distance.squareform.html#scipy.spatial.distance.squareform方法来自scipy.空间.距离 http://docs.scipy.org/doc/scipy/reference/spatial.distance.html:
In [12]: df
Out[12]:
CITY LATITUDE LONGITUDE
0 A 40.745392 -73.978364
1 B 42.562786 -114.460503
2 C 37.227928 -77.401924
3 D 41.245708 -75.881241
4 E 41.308273 -72.927887
In [13]: from scipy.spatial.distance import squareform, pdist
In [14]: pd.DataFrame(squareform(pdist(df.iloc[:, 1:])), columns=df.CITY.unique(), index=df.CITY.unique())
Out[14]:
A B C D E
A 0.000000 40.522913 4.908494 1.967551 1.191779
B 40.522913 0.000000 37.440606 38.601738 41.551558
C 4.908494 37.440606 0.000000 4.295932 6.055264
D 1.967551 38.601738 4.295932 0.000000 2.954017
E 1.191779 41.551558 6.055264 2.954017 0.000000
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