[LONGITUDINAL]
input = {Init, g1, Yp, g2}


EQUATION:

if t < ((Yp-Init)/exp(g1))
  Y = Init + exp(g1)*(t)
else
 Y = Init + exp(g1)*((Yp-Init)/exp(g1)) - exp(g2)*(t - ((Yp-Init)/exp(g1)))
end


OUTPUT:
output = Y