Creating a variable depending one another

Hi!

I want to create one variable depending if another is above or below zero, I currently have the following code;

Buy = r(average>0)

But I want the "Buy" variable to include another variable for when average<0, so that "Buy" consists of r when average>0 and f when average<0. I tried to use help, but I havent found anything to help me yet. If somebody could point me in the right direction it would be greatly appreciated! Thanks!

Answer 1

[Matt J]

What is B when average=0? If I assume it's f, then you could do

B=f; 
idx=(average>0);

B(idx) = r(idx);