Dear List: I am generating N datasets using the following
Sigma<-matrix(c(400,80,80,80,80,400,80,80,80,80,400,80,80,80,80,400),4,4 ) mu<-c(100,150,200,250) N=100 for(i in 1:N) { assign(paste("Data.", i, sep=''), as.data.frame(cbind(seq(1:1000),(mvrnorm(n=1000, mu, Sigma))))) } With these datasets, I need to work on some of the variables and then run each dataset through a linear model. I am having some trouble working with variables within the loop and wonder if anyone can offer any pointers. The first thing I am trying to do is add 2 variables together that are in each dataset. I am sure this is extremely trivial, but I can't seem to get that to work. I have tried: for (i in 1:5){ assign(paste("x",i,sep=""),(get(paste("Data.",i,sep=""))[["V2"]])+(get(p aste("Data.",i,sep=""))[["V2"]])) } Now, this code works, but I want for this vector to be a variable within each dataframe. Outside the loop, the equivalent code would be attach(Data.1) Data.1$V6<-V1+V2 Detach(Data.1) Another task I would like to perform is to reshape each dataframe for longitudinal analysis. I have tried the following: for (i in 1:5){ assign(paste("long",i,sep=""),reshape(paste("Data.",i,sep=""),idvar=get( paste("Data.",i,sep="")[["V1"]]), varying=list(names(get(paste("Data",i,sep="")[["V2"]]):get(paste("Data", i,sep="")[["V5"]])),v.names="score",direction="long") } This isn't working and I'm not sure if the code is even close. In general, performing all of these operations outside a loop for a single dataframe is simple. My trouble is performing equivalent operations within a loop. Thanks for any help offered. Harold [[alternative HTML version deleted]] ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html