File: folhp.f

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      integer function folhp(ls,alpha,beta,s,p)
c     Copyright INRIA
      integer ls
      double precision alpha,beta,s,p
c!purpose
c      this routine checks if
c    the real root alpha/beta lies in the open left half plane
c       (if ls=1)
c     the complex conjugate roots with sum s and product p lie
c     in the open left half plane (if ls=2)
c     if so, folhp=1, otherwise, folhp=-1
c      in this function the parameter p is not referenced
c
c!calling sequence
c
c     integer function folhp(ls,alpha,beta,s,p)
c     integer ls
c     double precision alpha,beta,s,p
c!auxiliary routines
c     none
c!
      folhp=-1
      if(ls.eq.2) go to 2
      if(alpha*beta.lt.0.0d+0) folhp=1
      return
 2    if(s.lt.0.0d+0) folhp=1
      return
      end