39) How to calculate length of values of each row in

[@sudipnarayanchoudhury1112]

Can u pls clarify why we used 0,0 .. it was not clear bcz we are actually not replacing anything..

[@intelligenceforbusiness]

We can't simply put , , here. Substitute will not allow this so we put 0,0..because of we are not changing anything so we put 0,0.