[R] make one matirx in list after removing duplicated rows

[David Winsemius]

That did not actually deliver the requested results because it bound  
before it unique-ed.

 > unique(do.call(rbind,z))
      [,1] [,2]
[1,]   11    0
[2,]    9    0
[3,]   10    1
[4,]    7    1

  I found it necessary to do a bit more list processing before the  
rbind:

 > do.call( rbind,  lapply(z, function(x) x[!duplicated(x[,1]), ] ) )
      [,1] [,2]
[1,]   11    0
[2,]    9    0
[3,]   10    1
[4,]    7    1
[5,]   10    1

-- 
David Winsemius

On Jul 28, 2009, at 6:29 PM, Jorge Ivan Velez wrote:

> Dear Kathryrn,
> Here is one way:
>
> unique(do.call(rbind,z))
>
> See ?unique, ?do.call and ?rbind for more information.
>
> HTH,
>
> Jorge
>
>
> On Tue, Jul 28, 2009 at 6:21 PM, kathie <> wrote:
>
>>
>> Dear R users...
>>
>>
>> I have a list, "z", below.
>>
>>
>> z<-list(matrix(c(11,11,9,0,0,0),3,2),matrix(c(10,10,10,1,1,1),3,2),
>>       matrix(c(7,10,1,1),2,2))
>>
>>> z
>> [[1]]
>>    [,1] [,2]
>> [1,]   11    0
>> [2,]   11    0
>> [3,]    9    0
>>
>> [[2]]
>>    [,1] [,2]
>> [1,]   10    1
>> [2,]   10    1
>> [3,]   10    1
>>
>> [[3]]
>>    [,1] [,2]
>> [1,]    7    1
>> [2,]   10    1
>>
>>
>>> From the list, I need to remove duplicated rows based on the 1st  
>>> column in
>> each "z" element, and then eventually make one matrix as followings;
>>
>>    [,1] [,2]
>> [1,]   11    0      <---- from z[1]
>> [2,]    9    0       <---- from z[1]
>> [3,]   10    1      <---- from z[2]
>> [4,]    7    1      <---- from z[3]
>> [5,]   10    1      <---- from z[3]
>>
>> Any comments will be greatly appreciated.
>>
>> Regards,
>>
>> Kathyrn Lord
>>
>>
>>
>> --
>> View this message in context:
>> http://www.nabble.com/make-one-matirx-in-list-after-removing-duplicated-rows-tp24708937p24708937.html
>> Sent from the R help mailing list archive at Nabble.com.
>>
>> ______________________________________________
>> R-help at 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.
>>
>
> 	[[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at 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.

David Winsemius, MD
Heritage Laboratories
West Hartford, CT