Thanks Chris, But, is there any option in order to avoid writing "with=FALSE" 
every timein the next situation?:  
# USING DATA FRAME set.seed(100)DF = 
data.frame(A=letters[1:5],B=rnorm(5),C=rexp(5),D=runif(5))DF2 <- 
data.frame(a=DF[,1],d=DF[,4],B=DF[,2])If I do the equivalent operations under 
data table format, I'm onñy able to obtain
the same result with the following code: # USING DATA TABLEset.seed(100)DT = 
data.table(A=letters[1:5],B=rnorm(5),C=rexp(5),D=runif(5))DT2 <- 
data.table(DT[,1,with=FALSE], DT[,4,with=FALSE], 
DT[,2,with=FALSE])setnames(DT2, c('a','d','B')) Thank you!                      
                   
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