[R] merge matrix row data

[Bert Gunter]

Time to do some homework, Elaine:

?regexp

There are also numerous online tutorials on regular expressions that
you can use to educate yourself.

Cheers,
Bert

On Wed, Jul 31, 2013 at 2:07 PM, Elaine Kuo <elaine.kuo.tw at gmail.com> wrote:
> Dear Arun
>
> Thank you for the very useful help.
> However, please kindly explain the code below.
> row.names(mat1)<- gsub("[_]"," ",row.names(mat1))
>
> 1. what does "[_]" mean?
> 2. what does " "  mean?
> 3. what does row.names(mat1) mean?
>
> I checked ?gsub but still did not get the idea.
>
> Thank you again
>
> Elaine
>
>
> On Wed, Jul 31, 2013 at 9:35 PM, arun <smartpink111 at yahoo.com> wrote:
>
>> HI,
>>
>> Please use ?dput()
>> mat1<- as.matrix(read.table(text="
>> D0989  D9820  D5629  D4327  D2134
>> GID_1    1        0        0      1      0
>> GID_2    0        1        1      0      0
>> GID_4    0        0        1      0      0
>> GID_5    1        1        0      0      0
>> GID_7    0        1        0      0      1
>> ",sep="",header=TRUE))
>> row.names(mat1)<- gsub("[_]"," ",row.names(mat1))
>> IslandA<-c("GID 1", "GID 5")
>> IslandB<- c("GID 2", "GID 4", "GID 7")
>>  res<-  t(sapply(c("IslandA","IslandB"),function(x)
>> {x1<-mat1[match(get(x),row.names(mat1)),];(!!colSums(x1))*1} ))
>>
>>  res
>> #        D0989 D9820 D5629 D4327 D2134
>> #IslandA     1     1     0     1     0
>> #IslandB     0     1     1     0     1
>> A.K.
>>
>>
>>
>>
>> ----- Original Message -----
>> From: Elaine Kuo <elaine.kuo.tw at gmail.com>
>> To: "r-help at stat.math.ethz.ch" <r-help at stat.math.ethz.ch>
>> Cc:
>> Sent: Wednesday, July 31, 2013 9:03 AM
>> Subject: [R] merge matrix row data
>>
>> Dear list,
>>
>>
>>
>> I have a matrix showing the species presence-absence on a map.
>>
>> Its rows are map locations, represented by GridCellID, such as GID1 and GID
>> 5.
>>
>> Its columns are species ID, such as D0989, D9820, and D5629.
>>
>> The matrix is as followed.
>>
>>
>>
>> Now I want to merge the GridCellID according to the map location of each
>> island.
>>
>> For instance, Island A consist of GID 1 and 5. Island B consist of GID 2,
>> 4, and 7.
>>
>> In GID 1 and 5, species D0989 are both 1.
>>
>> Then I want to merge GID 1 and 5 into Island A, with species D0989 as 1.
>>
>> The original matrix and the resulting matrix are listed below.
>>
>> Please kindly advise how to code the calculation in R.
>>
>> Please do not hesitate to ask if anything is unclear.
>>
>> Thank you in advance.
>>
>>
>>
>> Elaine
>>
>>
>>
>> Original matrix
>>
>>         D0989   D9820  D5629  D4327  D2134
>>
>> GID 1    1        0        0       1      0
>>
>> GID 2    0        1        1       0      0
>>
>> GID 4    0        0        1       0      0
>>
>> GID 5    1        1        0       0      0
>>
>> GID 7    0        1        0       0      1
>>
>>
>>
>> Resulting matrix
>>
>>                 D0989   D9820  D5629  D4327  D2134
>>
>> Island A   1        1       0       1       0
>>
>> Island B   0        1       1       0       1
>>
>>     [[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.
>>
>>
>
>         [[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.



-- 

Bert Gunter
Genentech Nonclinical Biostatistics

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