Thanks much Jim.
On Fri, Dec 5, 2008 at 2:05 PM, jim holtman <[EMAIL PROTECTED]> wrote:
> This should get you close:
>
> > x <- read.table(textConnection("myID myType myNum1 myNum2 myNum3
> + a Single 10 11 12
> + b Single 15 25 35
> + c Double 22 33 44
> + d Double 4 6 8"), header=TRUE)
> > closeAllConnections()
> > y <- lapply(split(x, x$myType), function(.type){
> + .means <- colMeans(.type[,3:5])
> + # create the new line for the data frame
> + .df <- data.frame(myID='', myType=.type$myType[1], myNum1=.means[1],
> + myNum2=.means[2], myNum3=.means[3])
> + rbind(.type, .df) # append the line to the original dataframe
> + })
> > do.call(rbind, y) # you can add the names your want
> myID myType myNum1 myNum2 myNum3
> Double.3 c Double 22.0 33.0 44.0
> Double.4 d Double 4.0 6.0 8.0
> Double.myNum1 Double 13.0 19.5 26.0
> Single.1 a Single 10.0 11.0 12.0
> Single.2 b Single 15.0 25.0 35.0
> Single.myNum1 Single 12.5 18.0 23.5
>
>
> On Fri, Dec 5, 2008 at 3:21 PM, Ferry <[EMAIL PROTECTED]> wrote:
> > Dear R users,
> >
> > Suppose I have the following data.frame:
> >
> > myID myType myNum1 myNum2 myNum3
> > a Single 10 11 12
> > b Single 15 25 35
> > c Double 22 33 44
> > d Double 4 6 8
> >
> > and I want to have new records:
> >
> > myID myType myNum1 myNum2 myNum3
> > e Single 12.5 18 23.5
> > f Double 13 19.5 28
> >
> > where record e got its myNum1-3 as the average from record a and b, and
> > record f got its myNum1-3 as the average from record c and d.
> >
> > and the final data.frame should be like the following:
> >
> > myID myType myNum1 myNum2 myNum3
> > a Single 10 11 12
> > b Single 15 25 35
> > e Single 12.5 18 43.5
> > c Double 22 33 44
> > d Double 4 6 8
> > f Double 13 19.5 28
> >
> > Any idea is appreciated. Thanks beforehand.
> >
> > Ferry
> >
> > [[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.
> >
>
>
>
> --
> Jim Holtman
> Cincinnati, OH
> +1 513 646 9390
>
> What is the problem that you are trying to solve?
>
[[alternative HTML version deleted]]
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