How to create new columns in a data set in function of specific columns?

Lets say I have a table with columns: x1, x2, …, x1000.

And I’d like to create many other columns as a function of specific ones, lets say for example:

y1 = x1 + x3
y2 = x568 / x763

y120121 = x3 / (x999 - x1) - x750

The thing is I have a non-fixed number of columns to create related (each one) to specific inputs of the table.

Thanks for the help you could provide.

What about

Or perhaps Arbitrary_expressions.knwf (18.7 KB)