subroutine hunt(xx ,n ,x ,jlo ) !----- GPL --------------------------------------------------------------------- ! ! Copyright (C) Stichting Deltares, 2011-2014. ! ! This program is free software: you can redistribute it and/or modify ! it under the terms of the GNU General Public License as published by ! the Free Software Foundation version 3. ! ! This program is distributed in the hope that it will be useful, ! but WITHOUT ANY WARRANTY; without even the implied warranty of ! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ! GNU General Public License for more details. ! ! You should have received a copy of the GNU General Public License ! along with this program. If not, see . ! ! contact: delft3d.support@deltares.nl ! Stichting Deltares ! P.O. Box 177 ! 2600 MH Delft, The Netherlands ! ! All indications and logos of, and references to, "Delft3D" and "Deltares" ! are registered trademarks of Stichting Deltares, and remain the property of ! Stichting Deltares. All rights reserved. ! !------------------------------------------------------------------------------- ! $Id$ ! $HeadURL$ !!--description----------------------------------------------------------------- ! NONE !!--pseudo code and references-------------------------------------------------- ! NONE !!--declarations---------------------------------------------------------------- use precision_basics ! implicit none ! ! Global variables ! integer :: jlo integer , intent(in) :: n real(kind=hp) , intent(in) :: x real(kind=hp), dimension(n), intent(in) :: xx ! ! Local variables ! integer :: inc integer :: jhi integer :: jm logical :: ascnd ! !! executable statements ------------------------------------------------------- ! ascnd = xx(n)>=xx(1) if (jlo<=0 .or. jlo>n) then jlo = 0 jhi = n + 1 goto 3 endif inc = 1 if (x>=xx(jlo) .eqv. ascnd) then 1 continue jhi = jlo + inc if (jhi>n) then jhi = n + 1 elseif (x>=xx(jhi) .eqv. ascnd) then jlo = jhi inc = inc + inc goto 1 else endif else jhi = jlo 2 continue jlo = jhi - inc if (jlo<1) then jlo = 0 elseif (xxx(jm) .eqv. ascnd) then jlo = jm else jhi = jm endif goto 3 end subroutine hunt