How to bind data.table without increasing the memory consumption?

Question

I have few huge datatable dt_1, dt_2, ..., dt_N with same cols. I want to bind them together into a single datatable. If I use

dt          


        

Answer 1

I guess <<- and get can help you with this.

UPDATE: <<- is not necessary.

df1 <- data.frame(x1=1:4, x2=letters[1:4], stringsAsFactors=FALSE)
df2 <- df1
df3 <- df1

dt.lst <- c("df2", "df3")

for (i in dt.lst) {
  df1 <- rbind(df1, get(i))
  rm(list=i)
}

df1