[R] combining 4 vectors into one

[Christopher Desjardins]

Hi,
How can I perform the following

y1    y2    y3    y4
1      0       3       2
0      1       2       1
3      2       0       1
0      5       1       0

into ...

 > y
  1 0 3 2 0 1 2 1 3 2 0 1 0 5 1 0


Please cc me on reply as I subscribe to the digest.
Thanks!
Chris