[R] how to stack a list of arrays

[Ernest Adrogué]

Hello,

I have this list of 2-d arrays:

$`0`
             k        d
[1,] 0.2011962 4.019537
[2,] 0.2020706 5.722719
[3,] 0.2029451 7.959612

$`1`
             k        d
[1,] 0.3148325 2.606903
[2,] 0.3160287 3.806665
[3,] 0.3172249 5.419222

$`2`
             k        d
[1,] 0.2332536 4.949390
[2,] 0.2342188 7.115258
[3,] 0.2351840 9.955909

which I need to transform into a data frame like this one:

             k        d group
[1,] 0.2011962 4.019537     0
[2,] 0.2020706 5.722719     0
[3,] 0.2029451 7.959612     0
[1,] 0.3148325 2.606903     1
[2,] 0.3160287 3.806665     1
[3,] 0.3172249 5.419222     1
[1,] 0.2332536 4.949390     2
[2,] 0.2342188 7.115258     2
[3,] 0.2351840 9.955909     2

Is there any R function that I can use? I know stack() but it only
works with vectors.

Thank you!
Ernest