rbind dataframes with a different column name

Question

I've 12 data frames, each one contains 6 columns: 5 have the same name, 1 is different. Then when I call rbind() I get:

Error in match.names(clabs, names(xi)) : 
  names do not match previous names

The column that differs is: "goal1Completions". There are 12 goalsCompletions... they are: "goal1Completions", "goal2Completions", "goal3Completions"... and so on.

The best way I can think of is: renaming every column in every data frame to "GoalsCompletions" and then using "rbind()".

Is there a simpler way?

Look on Google O found this package: "gtools". It has a function called: "smartbind". However, after using smartbind() i want to see the the data frame with "View()", my R session crashes...

My data (an example of the first data frame):

       date      source     medium   campaign   goal1Completions    ad.cost           Goal
1   2014-10-01  (direct)    (none)   (not set)          0           0.0000            Vida
2   2014-10-01   Master      email     CAFRE            0           0.0000            Vida
3   2014-10-01  apeseg      referral (not set)          0           0.0000            Vida

Answer 1

My favourite use of mapply:

Example Data

a <- data.frame(a=runif(5), b=runif(5))
> a
          a         b
1 0.8403348 0.1579255
2 0.4759767 0.8182902
3 0.8091875 0.1080651
4 0.9846333 0.7035959
5 0.2153991 0.8744136

and b

b <- data.frame(c=runif(5), d=runif(5))
> b
          c         d
1 0.7604137 0.9753853
2 0.7553924 0.1210260
3 0.7315970 0.6196829
4 0.5619395 0.1120331
5 0.5711995 0.7252631

Solution

Using mapply:

> mapply(c, a,b)    #or as.data.frame(mapply(c, a,b)) for a data.frame
              a         b
 [1,] 0.8403348 0.1579255
 [2,] 0.4759767 0.8182902
 [3,] 0.8091875 0.1080651
 [4,] 0.9846333 0.7035959
 [5,] 0.2153991 0.8744136
 [6,] 0.7604137 0.9753853
 [7,] 0.7553924 0.1210260
 [8,] 0.7315970 0.6196829
 [9,] 0.5619395 0.1120331
[10,] 0.5711995 0.7252631

And based on @Marat's comment below:

You can also do data.frame(mapply(c, a, b, SIMPLIFY=FALSE)) or, alternatively, data.frame(Map(c,a,b)) to avoid double data.frame-matrix conversion