Is this what you want it to do? (aDF is the original data frame)
> aDF
V1 V2 V3 V4
1 2006-02-22 16:28:18 useractivity_act 8 0
2 2006-02-22 16:28:26 4 2 0
3 2006-02-22 16:28:28 3 3 0
4 2006-02-22 16:28:31 4 4 1
5 2006-02-22 16:28:35 3 159 0
6 2006-02-22 16:31:14 useractivity_idle 0 0
7 2006-02-22 16:28:18 useractivity_act 8 0
8 2006-02-22 16:28:26 4 2 0
9 2006-02-22 16:28:28 3 3 0
10 2006-02-22 16:28:31 4 4 0
11 2006-02-22 16:28:35 3 159 25
12 2006-02-22 16:31:14 useractivity_idle 0 0
> with(aDF, aggregate(V4, by=list(V1, V2, V3), sum))
Group.1 Group.2 Group.3 x
1 2006-02-22 16:31:14 useractivity_idle 0 0
2 2006-02-22 16:28:26 4 2 0
3 2006-02-22 16:28:28 3 3 0
4 2006-02-22 16:28:31 4 4 1
5 2006-02-22 16:28:18 useractivity_act 8 0
6 2006-02-22 16:28:35 3 159 25
hth
Keith J
"Tammy Ma" <metal_lical...@live.com> wrote in message
news:bay0-dp3-858363e64f6ed84f9f6f486...@phx.gbl...
>
> My aim is not only relect unduplicated column, I also want merge the last
> column beside selection
> Thanks.
>
> Tammy
>
>
>
>
>> Date: Tue, 17 Mar 2009 06:59:20 -0400
>> From: pcho...@ncsu.edu
>> To: metal_lical...@live.com
>> CC: r-help@r-project.org
>> Subject: Re: [R] Merging
>>
>> Is this what you want it to do ('n' is the original data frame)?
>>
>> > n
>> v V1 V2 V3 V4
>> 1 k a 2 1 2
>> 2 l b 1 2 1
>> 3 m c 2 1 2
>> 4 n d 1 2 1
>> 5 o e 2 1 2
>> > n1 <- n[,3:5]
>> > n2 <- duplicated(n1)
>> > n3 <- n[!n2,]
>> > n3
>> v V1 V2 V3 V4
>> 1 k a 2 1 2
>> 2 l b 1 2 1
>>
>>
>> Pankaj
>>
>>
>> Tammy Ma wrote:
>> > Thanks for your reply,
>> >
>> > I couldn't use the method what the example gives. Because Data frame is
>> > quite big, and it has so many rows which are repeated. I am not pretty
>> > sure about the range of 1000. It turns out I should merge those row
>> > which repeated.
>> > Tammy
>> >
>> >
>> >> From: simon.pick...@bto.org
>> >> To: metal_lical...@live.com; r-help@r-project.org
>> >> Subject: Re: [R] Merging
>> >> Date: Tue, 17 Mar 2009 10:02:51 +0000
>> >>
>> >> Hi,
>> >>
>> >> I'm pretty sure you dont mean "merge" since merge() creates a new big
>> >> data
>> >> frame from two small ones. It appears that you want to omit some rows.
>> >>
>> >> As I said before, get used to selecting rows like this
>> >>
>> >> data.frame<-data.frame[data.frame$conditional.rows>1000,]
>> >>
>> >> (for example)
>> >>
>> >> Although I dont have a clue what criteria you are using to select the
>> >> rows
>> >> you want...
>> >>
>> >> Simon.
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>> Hi, All.
>> >>>
>> >>>
>> >>> I have a data frame with the part as :
>> >>>
>> >>> .....
>> >>> 142 2006-02-22 16:28:18 useractivity_act 8 0
>> >>> 143 2006-02-22 16:28:26 4 2 0
>> >>> 144 2006-02-22 16:28:28 3 3 0
>> >>> 145 2006-02-22 16:28:31 4 4 1
>> >>> 146 2006-02-22 16:28:35 3 159 0
>> >>> 147 2006-02-22 16:31:14 useractivity_idle 0 0
>> >>> 1421 2006-02-22 16:28:18 useractivity_act 8 0
>> >>> 1431 2006-02-22 16:28:26 4 2 0
>> >>> 1441 2006-02-22 16:28:28 3 3 0
>> >>> 1451 2006-02-22 16:28:31 4 4 0
>> >>> 1461 2006-02-22 16:28:35 3 159 25
>> >>> 1471 2006-02-22 16:31:14 useractivity_idle 0 0
>> >>> ....
>> >>>
>> >>> I want to merge the above as
>> >>> 142 2006-02-22 16:28:18 useractivity_act 8 0
>> >>>
>> >>> 143 2006-02-22 16:28:26 4 2 0
>> >>>
>> >>> 144 2006-02-22 16:28:28 3 3 0
>> >>>
>> >>> 145 2006-02-22 16:28:31 4 4 1
>> >>>
>> >>> 146 2006-02-22 16:28:35 3 159 25
>> >>>
>> >>> 147 2006-02-22 16:31:14 useractivity_idle 0 0
>> >>>
>> >>> How should I do`??
>> >>> Thanks.
>> >>>
>> >>> Tammy
>> >>> _________________________________________________________________
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>> >>> PLEASE do read the posting guide
>> >>> http://www.R-project.org/posting-guide.html
>> >>> and provide commented, minimal, self-contained, reproducible code.
>> >>>
>> >>>
>> >
>> > _________________________________________________________________
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>> > ______________________________________________
>> > R-help@r-project.org mailing list
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>> > PLEASE do read the posting guide
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>> > and provide commented, minimal, self-contained, reproducible code.
>> >
>
> _________________________________________________________________
> Invite your mail contacts to join your friends list with Windows Live
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> [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
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