[R] How to pool a group of samples and take the ave.

[Benilton Carvalho]

it's defined in Biobase.

On Nov 12, 2007, at 3:30 PM, affy snp wrote:

> Thanks Jim. It is way simple. Great.
> Is there any function like rowMedians() which
> could take the median value across samples?
>
> Allen
>
> On Nov 12, 2007 3:10 PM, jim holtman <jholtman at gmail.com> wrote:
>> Try something like this:
>>
>> myAvg <- rowMeans(A[,48:243])
>> B <- A[1:47,] / myAvg
>>
>>
>> On Nov 12, 2007 1:37 PM, affy snp <affysnp at gmail.com> wrote:
>>> Dear list,
>>>
>>> Hi! I have a table A, 238304 rows and 243 columns (representing
>>> samples). First of all, I would like to pool a group of samples
>>> from 48th column to 243rd column and take the average across
>>> them and make a single column,saying as the reference column.
>>>
>>> Second, I want to use each column of first 47 columns in table
>>> A divided by the reference column and end up with a new table
>>> B with 238304 rows and 47 columns.
>>>
>>> Is there any simple code which especially could do sth like
>>>       reference_column<-(A[,48]+A[,49]+...A[,243])/196
>>> and B<-A[,1:47]/reference_column?
>>>
>>> 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.
>>>
>>
>>
>>
>> --
>> Jim Holtman
>> Cincinnati, OH
>> +1 513 646 9390
>>
>> What is the problem you are trying to solve?
>>
>
> ______________________________________________
> 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.