Euler's Number in Stata

[Rayne Zhao]

Hello,
I am trying to define a program with:

program define MC_3, rclass
version 15
clear
drop _all
set obs 200

gen x = runiform(0,5)
gen U = rnormal(0,100)
gen m = e^x - 4*(x^2)
gen Y = m+U
end

e is supposed to be Euler's number but it shows up as 'e not found'. How can I distinguish between e as Euler's number and e as a return command?

Thanks in advance,
Rayne

[Hong Il Yoo]

https://www.stata.com/support/faqs/s...roni-constant/

[Mike Lacy]

In context, it appears to me that Rayne wants e, not the other Euler constant, in which case Rayne needs to use functional notation, i.e., exp(x, ) not e^x. Every computer language I know uses exp(x) for this purpose, so Stata is standard in this respect.

[Hong Il Yoo]

In context, it appears to me that Rayne wants e, not the other Euler constant, in which case Rayne needs to use functional notation, i.e., exp(x, ) not e^x. Every computer language I know uses exp(x) for this purpose, so Stata is standard in this respect.

Rayne Zhao Mike’s answer is spot on, please ignore the link I pasted.

[Rayne Zhao]

Thank you both!