Use expr() to replace variable column names in a formula
I try to create nested loops:1st loop create some columns and have formula with it2nd loop create some other columns, and the formula will need columns from 1st loopMy question is in 2nd loop, I cannot correctly setup the column names in formula by using eval() + substitue() + expr()Names Default To Here( 1 );
dt = current data table();
a=3;
b=3;
alist = {1,2,3};
blist = {1,2,3};
// In actual sc
...