Dataframes in a list; adding a new variable with name of dataframe

Question

I have a list of dataframes which I eventually want to merge while maintaining a record of their original dataframe name or list index. This will allow me to subset etc acro

Answer 1

dlply function form plyr package could be an answer:

library('plyr')
df1 <- data.frame(x=c(1:5),y=c(11:15))
df2 <- data.frame(x=c(1:5),y=c(11:15))
mylist <- list(df1 = df1, df2 = df2)

all <- ldply(mylist)