Making alpha go down after some time., exponentially.

[CowThing]

Right now I have the alpha going down smoothly over time, but it's linear. I want it to be exponential, so that it'll start out slow and speed up, then slow again, or something.
[lua]alpha = math.Clamp(alpha-FrameTime()*175, 0, 255)[/lua]
What would the equation be?

[CowThing]

math.Approach is linear, it's basically what I have now.

[Nev]

How about this:

[lua]alpha = alpha * 0.8 - FrameTime( ) * speed;[/lua]

[SchumacherAlt]

Are you making fading text?

[CowThing]

[QUOTE=iRzilla;22868564]speed = math.sin(CurTime())

Maybe?[/QUOTE]

Exponential, as in, exponents. I looked up exponential decay, I think I have it.
[lua]alpha = math.Clamp(alpha-alpha^(FrameTime()*10), 0, 255)[/lua]

[editline]02:43AM[/editline]

[QUOTE=SchumacherAlt;22868765]Are you making fading text?[/QUOTE]

yeah, it's a new TargetID that fades out.

[SchumacherAlt]

Ah, that's cool. Good luck, Post a video of it when you finish, =]