Re: [R] How to take the ave of two rows in a data frame

Try the reshape package This should do what you want. library(reshape) df1 <- melt(mydata, id=c("ID"), measured=c("a1","a2","a3")) ; df1 stats <- cast(df1, ID ~ variable , mean) ; stats = --- affy

Re: [R] How to take the ave of two rows in a data frame

Would ?aggregate help? affy snp wrote: > >> Dear list, >> I have a data frame like: >> >> > log2.ratios[1:3,1:4] >>ID a1 a2 a3 >> 1 GS1-232B23 -0.0207500 0.17553833 0.21939333 >> 2 RP11-82D16 -0.1896667 0.02645167 -0.03112333 >> 3

[R] How to take the ave of two rows in a data frame

> Dear list, > I have a data frame like: > > > log2.ratios[1:3,1:4] >ID a1 a2 a3 > 1 GS1-232B23 -0.0207500 0.17553833 0.21939333 > 2 RP11-82D16 -0.1896667 0.02645167 -0.03112333 > 3 RP11-62M23 -0.1761700 0.08214500 -0.04877000 > 4