Hi, not sure where to put this, so i'll just put it here. i was wondering if there is a way to define functions of this sort in mathematica. For example. f(x)=x if x>0 and f(x)=2x if x<=0. I know you can break it up into 2 functions and go something like g[x_]:=x; h[x_]:=2x; but those are 2 different functions with different domain ranges (0,Inf), (-Inf,0]. what i want is just 1 function in mathematica with domain (-Inf, Inf) that knows to use g if x>0, and h if x<=0 in my example. Thank you. *edit i figured it out, PS how do i delete my post?