/home/uryu/Cocal_svn_checkinout/Cocal/code/Subroutine/interpo_gr2fl_linear.f90

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subroutine interpo_gr2fl(grv,flv)
  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(2), f(2)
  real(long) :: rrff,   small = 1.0d-14
  integer :: irg, irf, itf, ipf, ir0
!
  flv(0:nrf,0:ntf,0:npf) = 0.0d0
!
  do ipf = 0, npf
    do itf = 0, ntf
      do irf = 0, nrf
        rrff = rs(itf,ipf)*rg(irf)
        do irg = 0, nrg
          if (rrff.le.rg(irg)) then 
            ir0 = min0(max0(0,irg-1),nrg-1)
            exit
          end if
        end do
        x(1:2) = rg(ir0:ir0+1)
        f(1:2) = grv(ir0:ir0+1,itf,ipf)
        flv(irf,itf,ipf) = ((x(2)-rrff)*f(1)+(rrff-x(1))*f(2))/(x(2)-x(1))
      end do
    end do
  end do
!
end subroutine interpo_gr2fl

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