I have a dataframe say having C0,C1,C2 and so on as columns.
I need to create interaction variables to be taken as input for my program.
For eg -
I need to create I1 as concatenation of C0,C3,C5
Similarly, I2 = concat(C4,C5)
and so on ..
How can I achieve this in my Java code for concatenation of any columns given input by the user.