rand_vpe.f

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      Subroutine rand_vpe( npes, info, lst )
! ----------------------------------------------------------------------
      Use      numerics
      Implicit None
      Integer, Intent(In)                       :: npes
      Integer, Intent(Out), Dimension(0:npes-1) :: lst 
      Logical, Intent(Out), dimension(0:npes-1) :: info
      Integer, Dimension (0:(npes/2) - 1) :: pv
      Logical  :: f
      Integer  :: i, j, k, n, np 
      Real(l_) :: r
! ---------------------------------------------------------------------- 
      np = npes/2
      Do i = 0, np-1
         pv(i) = i + np
      End Do
      Do i = 0, np-1
         j = pv(i)
         Call random_number( Harvest = r )
         k = Int( r*(np-1) + 0.5_l_ )
         pv (i) = pv(k)
         pv (k) = j
      End Do
      Do i = 0, np - 1
         lst (i) = pv(i)
         lst (pv(i)) = i
         Call random_number( Harvest = r )
         n = Int( r + 0.5_l_ )
         f = .FALSE.
         if ( n == 0 ) f = .TRUE. 
         info (i) = f
         info(pv(i)) = .NOT. f
      End Do
! ---------------------------------------------------------------------- 
      End subroutine rand_vpe