db$distinct 和 db$find 分别以数组和列表的形式返回结果。如何从集合中查找不同的值作为列表。
db$distinct("long")
[1] -108.6326 -108.6254 -105.9005 -105.8922 -105.8736 -105.8097 -105.7736 -105.4722 -105.4658 [10] -105.4500 -105.1056 -105.0172 -104.9831 -104.9828 -104.9681 -104.5333 -104.2675 -103.0944 [19] -103.0639
db$find( 字段 = '{"_id":0,"LONG":1}' )
2 -105.4500
3 -105.4500
4 -105.4500
5 -105.4500
6 -105.4500
7 -105.4500
……
关于如何将 db$distinct 结果作为类似于 db$find 的结果的列表的任何想法？
谢谢