generating positive and negative components of a variable

[rabiya gill]

Dear members, I want to generate positive and negative components of a variable on stata for non-linear panel ARDL.

I am just stuck on this stage. I need stata command or code. please help.

Regards,
Rabiya gill

[Nick Cox]

gen pos = max(x, 0)
gen neg = abs(min(x, 0))

to satisfy an identity

x = pos - neg