GetVelocity() Specific Axis

Is there a way to make this code:


math.Round(ply:GetVelocity():Length()

Display the velocity only on the x and z axis?

EDIT: CHANGED LENGTH() TO LENGTH2D()

[lua]
local vel = ply:GetVelocity()
vel.y = 0

print(math.Round(vel:Length()))
[/lua]