If i understand your question, you can try this: cbind(summaryBy(B+C~ A, data=df,FUN=c(mean, var)), 'num rows'=as.numeric(table(df$A)))
On 26/12/2007, Agrarimmobilien <[EMAIL PROTECTED]> wrote: > Hello, > > I had to give some more information to my posting: > > as ouput there are more than one row, depending on the values of column A > (transformierung to distinct values, here 3 and 4, but there are much more) > > > A B C > > 1 3 6 5 > > 2 3 4 20 > > 3 3 8 2 > > 4 4 8 3 > > 5 4 2 6 > > Output: > > > A B C num rows > > 1 3 6 6.16 3 > > 2 4 5 4.00 3 > > > B is mean and C variance. > > > thank you > Macki > > > > > Hello, > > > > it seems to be a simple problem, but I couldn't find an answer in the > > archiv. (I think, it must has something to do with the group-select, like > > in > > php) > > > > I've the following data.frame: > > > > A B C > > 1 3 6 5 > > 2 4 4 20 > > 3 5 8 2 > > > > I want to get the number of the rows in the 4th column, like: > > > > A B C num rows > > 1 3 6 6.16 3 > > > > > > (B is mean, C is variance by using summaryBy(B+C~ A, data=daten, > > FUN=c(mean,var)) from the doBy-package) > > > > But, how can I add the column 'numrow' and count the number of the rows? > > > > Thanks! > > > > Macki > > > > ______________________________________________ > > [email protected] 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. > > > > ______________________________________________ > [email protected] 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. > -- Henrique Dallazuanna Curitiba-Paraná-Brasil 25° 25' 40" S 49° 16' 22" O ______________________________________________ [email protected] 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.
