[R] Combining data.frames

[Tom Woolman]

I'm trying hard to take tonight off and avoid booting up the laptop and 
launching R... :)   but you need to merge by the primary key(s), e.g. 
the common columns (common IVs) shared between the two dataframes.


On 2022-03-19 21:38, Jeff Reichman wrote:
> Tom
> 
> Looks like I figured it out. Syntax issue - wrong "all" argument  (I 
> think)
> 
> -----Original Message-----
> From: Tom Woolman <twoolman using ontargettek.com>
> Sent: Saturday, March 19, 2022 8:27 PM
> To: reichmanj using sbcglobal.net
> Cc: r-help using r-project.org
> Subject: Re: [R] Combining data.frames
> 
> You can also do "SQL-like" joins in the tidyverse with dplyr.
> 
> 
> On 2022-03-19 21:23, Jeff Reichman wrote:
>> Evening Tom
>> 
>> Yest I've been playing with the merge function.  But haven't been able
>> to achieve what I need. Could maybe the way to to and it might be my
>> syntax
>> 
>> -----Original Message-----
>> From: Tom Woolman <twoolman using ontargettek.com>
>> Sent: Saturday, March 19, 2022 8:20 PM
>> To: reichmanj using sbcglobal.net
>> Cc: r-help using r-project.org
>> Subject: Re: [R] Combining data.frames
>> 
>> Have you looked at the merge function in base R?
>> 
>> https://www.rdocumentation.org/packages/base/versions/3.6.2/topics/mer
>> ge
>> 
>> 
>> 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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