[Solved] Combine data table row elements into a new column as a vector [closed]

I am not sure if you want something like below

DT[,result := asplit(DT,1)]

such that

> DT
   col1 col2 col3 result
1:    1    a    x  1,a,x
2:    1    b    y  1,b,y
3:    1    c    z  1,c,z