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...cannot be interpreted but must be built first. JN Example using <<- rm(list=ls()) optstart<-function(npar){ # create structure for optimization computations # npar is number of parameters ?? test?? OPCON<<-list(MAXIMIZE=TRUE, PARSCALE=rep(1,npar), FNSCALE=1, KFN=0, KGR=0, KHESS=0) # may be other stuff ls(OPCON) } add1<-function(){ OPCON$KFN<<-1+OPCON$KFN test<-OPCON$KFN } OPCON<<-list(MAXIMIZE=TRUE, PARSCALE=rep(1,4), FNSCALE=1, KFN=0, KGR=0, KHESS=0) ls(OPCON) print(add1()) print(add1()) print(ls.str()) rm(OPCON) # Tr...

I have data that looks like this: > df1 group id 1 red A 2 red B 3 red C 4 blue D 5 blue E 6 blue F I want a list of the groups containing vectors with the ids. I am avoiding subset(), as it is only recommended for interactive use. Here's what I have so far: df1 <- data.frame(group=c("red", "red", "red", "blue",

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