Re: [R] sum(row1==y) if row2=x

Thanks to all R is fantastic but ... not easy to know all possible terms ;-) Knut __ 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

Re: [R] sum(row1==y) if row2=x

Hi Knut, Try sum(subset(df, row1 == 3 & row2 == 2)[,1]) and nrow(subset( df, row1 == 3 & row2 == 2) ) HTH, Jorge On Fri, Nov 13, 2009 at 1:59 PM, Knut Krueger <> wrote: > Hi to all > is there any construct to sum > data=data.frame(row1=c(1,1,3,1,2,3,2,2,1,3,4,5,2,3,2,1) , >

Re: [R] sum(row1==y) if row2=x

Try this: sum(data[with(data, row1 == 3 & row2 == 2),1]) and sum(with(data, row1 == 3 & row2 == 2)) On Fri, Nov 13, 2009 at 4:59 PM, Knut Krueger wrote: > Hi to all > is there any construct to sum > data=data.frame(row1=c(1,1,3,1,2,3,2,2,1,3,4,5,2,3,2,1) , >                         row2=c(2,2

[R] sum(row1==y) if row2=x

Hi to all is there any construct to sum data=data.frame(row1=c(1,1,3,1,2,3,2,2,1,3,4,5,2,3,2,1) , row2=c(2,2,1,1,1,2,1,2,1,1,1,1,2,2,2,1) ) Means I would like to get all y of row1 if in row2 of the data.frame is an x f.e row1=3 and row2=2 so I would like to get 6 And is