How to do Summations?

[Tim Chung]

Hello, I'm very new to stata and am having trouble figuring this out.
If have have 2 variable lists, lets just say var1 and var2, how can i find the ∑ⁿ_i=1 = (var1 + var2)²
I tried googling it to no success. Would I use egen?
Thanks for any help

[Joseph Coveney]

Maybe

generate double sum2 = (var1 + var2)^2
summarize sum2, meanonly
display in smcl as text r(sum)

[Tim Chung]

Bump

[Marcos Almeida]

Joseph gave you excellent advice in #2. Please explain why the need to bump in #3. Wouldn't the command above fit in your needs?