lots of thanks
Ragia
> Date: Wed, 2 Dec 2015 14:12:46 -0800
> Subject: Re: [R] extract rows based on column value in a data frame
> From: bgunter.4...@gmail.com
> To: dwinsem...@comcast.net
> CC: ragi...@hotmail.com; r-help@r-project.org
&g
...
Perhaps also worth mentioning -- David's solution works even if there
are less than 3 rows per group, whereas mine will fail.
Cheers,
Bert
Bert Gunter
"Data is not information. Information is not knowledge. And knowledge
is certainly not wisdom."
-- Clifford Stoll
On Wed, Dec 2, 2015 a
... or perhaps using rep() to do the indexing directly instead of matching:
dfrm[ ave(dfrm$v1, dfrm$v1, FUN =
function(x)rep(c(TRUE,FALSE),c(3,length(x)-3))), ]
There's probably another 6 dozen ways to do it, especially if you
access packages like data.table, plyr, etc.
Cheers,
Bert
Bert Gunte
> On Dec 2, 2015, at 10:09 AM, Ragia Ibrahim wrote:
>
> Dear Group,
> I have a data frame that such as
>
> v1 v2v3v4
> 1 1 3 6
> 1 1 5 6
> 1 1 8 0
> 1 2 6 1
> 1 2 4 0
> 1 3 4 4
> 1 3
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