[R] fetch uneven

[David Winsemius]

On Mar 16, 2011, at 1:21 PM, Henrik Bengtsson wrote:

> See ?seq for generating index vectors of different kinds.
>
> /Henrik
>

Most people will probably understand seq(...) better than they  
understand modulo arithmetic, but logical indexing  could also be used  
for the task:

((1:12) %/% 2) == 0   # substituting length(vector) for 12

-- 
David.

> On Wed, Mar 16, 2011 at 7:43 AM, rens <piccavet at hotmail.com> wrote:
>> Hi
>> I have a vector m:
>>  m
>>  [1] "ABC transporters"
>>  [2] "2"
>>  [3] "Acetyl-CoA"
>>  [4] "1"
>>  [5] "Energie"
>>  [6] "1"
>>  [7] "FAD Biosynthese"
>>  [8] "1"
>>  [9] "Glyoxylate and dicarboxylate metabolism"
>> [10] "1"
>> [11] "Transport"
>> [12] "1"
>> and i want to do take the even or uneven numbers out of them
>> you can do it lik this:
>> a<-m[c(1,3,5,7,9,11)]
>>
>> but i want to do this automatic and i never now how long the vector  
>> is.
>>
>> Can someone help me?
>>
>>
>> --
>> View this message in context: http://r.789695.n4.nabble.com/fetch-uneven-tp3381949p3381949.html
>> Sent from the R help mailing list archive at Nabble.com.
>>
>> ______________________________________________
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>> and provide commented, minimal, self-contained, reproducible code.
>>
>
> ______________________________________________
> 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
West Hartford, CT