[R] Combining data.frames

[Tom Woolman]

Have you looked at the merge function in base R?

https://www.rdocumentation.org/packages/base/versions/3.6.2/topics/merge


On 2022-03-19 21:15, Jeff Reichman wrote:
> R-Help Community
> 
> I'm trying to combine two data.frames which each containing 10 columns 
> of
> which they each share two common fields. Here are two small test 
> datasets.
> 
> df1 <- data.frame(date =
> c("2021-1-1","2021-1-1","2021-1-1","2021-1-1","2021-1-1",
> 
> "2021-1-2","2021-1-2","2021-1-3","2021-1-3","2021-1-3"),
>                   geo_hash =
> c("abc123","abc123","abc456","abc789","abc246","abc123",
>                                "asd123","abc789","abc890","abc123"),
>                   ad_id = 
> c("a12345","b12345","a12345","a12345","c12345",
>                             
> "b12345","b12345","a12345","b12345","a12345"))
> df2 <- data.frame(date =
> c("2021-1-1","2021-1-1","2021-1-2","2021-1-3","2021-1-3"),
>                   geo_hash =
> c("abc123","abc456","abc123","abc789","abc890"),
>                   event = 
> c("shoting","ied","protest","riot","protest"))
> 
> I'm trying to combine them such that I get a combined data.frames such 
> as
> 
> date		geo_hash	ad_id		event
> 1/1/2021	abc123		a12345		shoting
> 1/1/2021	abc123		b12345
> 1/1/2021	abc456		a12345		ied
> 1/1/2021	abc789		a12345
> 1/1/2021	abc246		c12345
> 
> Jeff
> 
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