dataframe - How can you combine two data frames in r so that the resulting data frame has a new column indicating the data frame of origin? -

suppose have 2 data frames, df1, , df2 , contain same column headers that,

df1 =  price size 10    40 

and

df2 =  price size 20    50 

i combine these 2 data frames resulting data frame has, price size origin

10 40 df1 20 50 df2 

thoughts?

the easiest way see it, (if have many data sets called df + number- though can choose other regex pattern too) them global environment , use do.call/rbind combination

res <- do.call(rbind, mget(ls(pattern = "^df\\d+$"))) res #     price size # df1    10   40 # df2    20   50 

if prefer origin column instead of row names, do

res$origin <- row.names(res)