/home/uryu/Cocal_svn_checkinout/Cocal/code/Subroutine/interpo_fl2gr_lag4th.f90

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subroutine interpo_fl2gr(flv,grv)
  use phys_constant, only : long
  use grid_parameter, only : nrg, ntg, npg, nrf, ntf, npf
  use coordinate_grav_r, only : rg
  use def_matter, only : rs
  implicit none
  real(long), external :: lagint_4th
  real(long), pointer :: grv(:,:,:), flv(:,:,:)
  real(long) :: x(4), f(4)
  real(long) :: rrff, rrgg, small = 1.0d-14
  integer :: irf, irg, itg, ipg, ir0
!
  grv(0:nrg,0:ntg,0:npg) = 0.0d0
!
  do ipg = 0, npg
    do itg = 0, ntg
      rrff = rs(itg,ipg)
      do irg = 0, nrg
        if (rg(irg).gt.rrff*rg(nrf)) exit
        do irf = 0, nrf
          if (rg(irg).le.rrff*rg(irf)) then 
            ir0 = min0(max0(0,irf-2),nrf-3)
            exit
          end if
        end do
        x(1:4) = rrff*rg(ir0:ir0+3)
        f(1:4) = flv(ir0:ir0+3,itg,ipg)
        rrgg = rg(irg)
        grv(irg,itg,ipg) = lagint_4th(x,f,rrgg)
      end do
    end do
  end do
!
end subroutine interpo_fl2gr

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