Unsteady udf, velocity step

CJ

Is it possible to write a unsteady udf such that:

t<2 velocity=20

t>2 velocity=30

I have used this sinusoidal function previously (below), but would like to have a simple step change as above

DEFINE_PROFILE(unsteady_velocity, thread, position) {

face_t f;

begin_f_loop(f, thread)

{

real t = RP_Get_Real("flow-time");

F_PROFILE(f, thread, position) = 25. + 5.0*sin(10.*t);

}

end_f_loop(f, thread) }