# Re: [R] Variance Calculation in R

From: Keizer_71 <christophe.lo_at_gmail.com>
Date: Sun, 02 Mar 2008 12:04:05 -0800 (PST)

unfortunately, it is not showing probeID

Henrique Dallazuanna wrote:
>
> Try this:
>
> write.table(cbind(data.matrix[1], Variance = apply(data.matrix[,-1],
> 1, var)), file='file.xls')
>
>
> On 02/03/2008, Keizer_71 <christophe.lo_at_gmail.com> wrote:

```>>
>> sorry...in step 4-i need the R code to output in this format when i
>> export
>> to
>> excel.
>>
>> 	ProbeID	    Variance
>> 1	224588_at   21.58257457
>>
>> thanks
>>
>>
>>
>> Keizer_71 wrote:
>> >
>> > Hello,
>> >
>> > Thanks everyone for helping me with the previous queries.
>> >
>> > step 1: Here is the orginal data: short sample
>> >
>> > 	ProbeID	    Sample_1_D	Sample_1_C    Sample_2_D	   Sample_2_C
>> > 1	224588_at   2.425509867	11.34031409   11.46868531	   11.75741478
>> >
>> > step 2: i calculate the variance of the sample using this R code
>> >
>> > x<-1:20000
>> > y<-2:141
>> > data.matrix<-data.matrix(data[,y])#create data.matrix
>> > variableprobe<-apply(data.matrix[x,],1,var)
>> >
>> > step 3: however, when i type in variableprobe, it gives me this.
>> >
>> > 1	21.58257457
>> >
>> > step 4: I need the code to output this:
>> >
>> > 	ProbeID	    Variance
>> > 1	224588_at   21.58257457
>> >
>> >
>> > What do i need to do to modify the code to give me better description
>> like
>> > the one above?
>> >
>> > thank.
>> > Keizer
>> >
>> >
>> >
>> >
>>
>> --
>> View this message in context:
>> http://www.nabble.com/Variance-Calculation-in-R-tp15790621p15790768.html
>> Sent from the R help mailing list archive at Nabble.com.
>>
>> ______________________________________________
>> R-help_at_r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
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>> and provide commented, minimal, self-contained, reproducible code.
>>
```

>
>
> --
> Henrique Dallazuanna
> Curitiba-Paraná-Brasil
> 25° 25' 40" S 49° 16' 22" O
>
> ______________________________________________
> R-help_at_r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
>
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