Message-ID: <da79af330803021105o4909e1dbke5f2232a3095c3c3@mail.gmail.com>
Date: 2008-03-02T19:05:21Z
From: Henrique Dallazuanna
Subject: Variance Calculation in R
In-Reply-To: <15791115.post@talk.nabble.com>
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
> >
> >
> >
> >
>
> --
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> http://www.nabble.com/Variance-Calculation-in-R-tp15790621p15791115.html
> Sent from the R help mailing list archive at Nabble.com.
>
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>
--
Henrique Dallazuanna
Curitiba-Paran?-Brasil
25? 25' 40" S 49? 16' 22" O