Hi Milton,
Thanks for trying to help anyway.
________________________________
From: milton ruser <milton.ru...@gmail.com>
Cc: r-help@r-project.org
Sent: Thursday, August 27, 2009 6:48:41 PM
Subject: Re: [R] subset of a matrix
Hi Carlos,
I think I made a wrong suggestion. Sorry about that.
I was thinking that if you have the same rowname length it helps you on the
data handling. Is it true?! Case yes I can try suggest another automatic way of
you get it.
bests
milton
On Thu, Aug 27, 2009 at 12:39 PM, milton ruser <milton.ru...@gmail.com> wrote:
Hi Carlos,
>
>how about this step first:
>
>rownames(mydata)<-gsub("361a","00361a",rownames(mydata))
>rownames(mydata)<-gsub("456a","00456a",rownames(mydata))
>
>good luck
> milton
>
>
>Hello everyone, I would appreciate any help with the following.
>>
>>My dataset is a list containing matrices. So if you type e.g.
>>
>>data[[1]]
>>
>>you get something like:
>>
>> [,1] [,2]
>>361a A T
>>456b A G
>>72145a T G
>>........
>>
>>As you can see my rows have names which are character strings containing
>>numbers and letters. I want something similar to a histogram, per column.
>>i.e. I want to know how many times I have a single repeat character in a
>>column and how many times I have a twice repeated character and so on. Maybe
>>there is an easy way to do this, but I wrote my own code which works
>>perfectly, so don't bother to correct it unless extremely necessary. I write
>>down the code so you know exactly what I'm trying to do:
>>
>>table <- vector()
>>
>>for (i in (1:length(data))){
>>
>> for (j in (1:length(data[[i]][1,]))){
>>
>> t <- table(data[[i]][,j])
>>
>> table <- c(table, t)
>>}}
>>
>>ncount <- table[names(table) != "-"] #this line is necessary to eliminate "-"
>>characters which should not be included in the analysis
>>
>>sfs <- table (ncount)
>>
>>And with this code I get something like:
>>
>> 1 2 3 4 5 6 7 8 9 10 ....
>>
>>542 125 98 49 47 41 26 31 22 18 ....
>>
>>which is what I'm looking for.
>>
>>
>>Now comes THE problem:
>>
>>As I said before my rows have names. Each name is unique. I want to apply my
>>analysis to a subset of rows en each matrix, namely all rows whose names
>>start with 3, all that start with 4, all that start with 721. In most cases
>>only the first character is important, but since I have names of different
>>length, in some cases I need the first three characters to differentiate the
>>groups. I want to integrate this into the loop so that I get a vector (such
>>as the one called "table" in my code) for each subset analyzed.
>>
>>I tried using the subset function, but I couldn't figure out how to use it,
>>because it's intended to use row values to define the subset, not row names.
>>
>>I hope someone can help me out, but please bear in mind I am really new at R
>>and most commands and parameters are really unfamiliar to me.
>>
>>Thanks.
>>
>>
>>
>> [[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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