How can I rbind vectors matching their column names?

Question

rbind does not check for column names when binding together vectors:

l = list(row1 = c(10, 20), row2 = c(20, 10)) names(l$row1) = c("A", "B") names(l$row2) = c("B", "A") l $row1  A  B  10 20   $row2  B  A  20 10   rbind(l$row1, l$row2)       A  B [1,] 10 20 [2,] 20 10 

How can I produce this matrix from a number of list elements, insuring the column names are correctly matched across rows:

      A  B [1,] 10 20 [2,] 10 20 

Answer 1

It seems that in current versions of R (I have version 3.3.0), rbind has the capacity to to join two data sets with the same name columns even if they are in different order.

   df1 <- data.frame(a = c(1:5), c = c(LETTERS[1:5]),b=c(11:15))    df2 <- data.frame(a = c(6:10), b = c(16:20),c=c(LETTERS[6:10]))    rbind(df1,df2)     a c  b 1   1 A 11 2   2 B 12 3   3 C 13 4   4 D 14 5   5 E 15 6   6 F 16 7   7 G 17 8   8 H 18 9   9 I 19 10 10 J 20