Re: [R] Variance Calculation in R

From: Henrique Dallazuanna <wwwhsd_at_gmail.com>
Date: Sun, 02 Mar 2008 16:05:21 -0300

Then you can try:

rownames(data.matrix) <- as.character(data.matrix$ProbeID) data.matrix <- data.matrix[-1]

as.matrix(apply(data.matrix1, 1, var))

or

out <- apply(data.matrix1, 1, var)
data.frame(ProbeID = names(out), Variance = unname(out))

Works for me

On 02/03/2008, Keizer_71 <christophe.lo_at_gmail.com> wrote:
>
> Hi Henrique,
>
> It is definitely better, but it doesn't show me the ProbeID which identify
> the probes name
>
> Here was the result when i export to excel with your code.
>
> "Variance"
> 1 2.425509867 21.6216446425273
>
>
> any suggestions?
>
> thanks,
> Kei
>
>
> 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-tp15790621p15791115.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> R-help_at_r-project.org mailing list
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>

-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O

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Received on Sun 02 Mar 2008 - 19:08:32 GMT

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