c
c
c =========================================================
       subroutine qinit(maxmx,meqn,mbc,mx,xlower,dx,q,maux,aux)
c =========================================================
c
c     # Set initial conditions for q.
c
c
      implicit double precision (a-h,o-z)
      dimension q(1-mbc:maxmx+mbc, meqn)
      dimension aux(1-mbc:maxmx+mbc, *)
      common /comsrc/  tau,beta,iode
c
c
      do 150 i=1,mx
	 xcell = xlower + (i-0.5d0)*dx
         xi = xcell/tau
         if (xi .lt. -20.d0) then
             q(i,1) = 0.d0
            else if (xi .gt. 20.d0) then
             q(i,1) = 1.d0
            else
             q(i,1) = dexp(xi) / (1.d0 + dexp(xi))
            endif
  150    continue
c
      return
      end