How to define a new variable in a table, Part 3

I have a table test

date breakfast lunch 
1/2/2020 10 20
1/3/2020 5  25
1/4/2020 8  20

Just for the sake of an exmple, I want to calculate a new variable with the formula

test.newvariable(k) = test.lunch(k)/sqrt(test.breakfast(k))

Can one define this new variable without using a loop?

Answer 1

[madhan ravi]

Remove (k) and replace / with ./

[alpedhuez]

let me work on it

[madhan ravi]

But we already made it in your previous questions , didn’t we ;)