[R] How to subset a portion of columns from a matrix

[Julian Burgos]

No problem.  Actually, I missed a comma.  You should do

A[,seq(1,dim(A)[2],2)]

Julian


affy snp wrote:
> Hi Julian,
>
> Thanks for the help!
>
> Best,
>       Allen
>
>
>
> On Nov 9, 2007 11:08 PM, Julian Burgos <jmburgos at u.washington.edu> wrote:
>   
>> There are many ways. For example, you can do something like
>>
>> A[seq(1,dim(A)[2],2)]
>>
>> Julian
>>
>> Julian M. Burgos
>>
>> Fisheries Acoustics Research Lab
>> School of Aquatic and Fishery Science
>> University of Washington
>>
>> 1122 NE Boat Street
>> Seattle, WA  98105
>>
>> Phone: 206-221-6864
>>
>>
>>
>>
>> affy snp wrote:
>>     
>>> Dear List,
>>>
>>> Hi! I am wondering what is the simplest way to subset a portion of columns
>>> from a matrix.
>>>
>>> For example, there is a matrix A (238,304*243). What is the simplest
>>> way to get a sub-matrix B which comprises of column 1, 3, 5, 7,9,...(odd column
>>> number) from matrix A?
>>>
>>> Thank you very much for your help!
>>>
>>> Best,
>>>      Allen
>>>
>>> ______________________________________________
>>> 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.
>>>
>>>       
>>
>>
>>     

-- 
Julian M. Burgos

Fisheries Acoustics Research Lab
School of Aquatic and Fishery Science
University of Washington

1122 NE Boat Street
Seattle, WA  98105 

Phone: 206-221-6864