# 1 "<stdin>"
# 1 "<built-in>"
# 1 "<command-line>"
# 1 "<stdin>"

module hconest
! masked helix convolution, adjoint is the filter.
  use adj_mod
  use helix
  implicit none
  real ,private, dimension (:), pointer :: x
  type( filter), private :: aa
  contains
  subroutine hconest_init ( x_in,aa_in )
    real , dimension (:), pointer :: x_in
    type( filter) :: aa_in
    x => x_in
    aa = aa_in
  end subroutine
  function hconest_lop ( adj, add, a, y) result(stat)
    integer :: stat
    logical,intent(in) :: adj,add
    real,dimension(:) :: a,y
    call adjnull (adj,add,a,y )
    call hconest_lop2(adj,add,a,y )
    stat=0
  end function
  subroutine hconest_lop2(adj,add,a,y)
    logical,intent(in) :: adj,add
    real, dimension (:) :: a
    real, dimension (:) :: y
    integer ia, ix, iy
    do ia = 1, size( a)
      do iy = 1 + aa%lag( ia), size( y)
        if ( aa%mis( iy)) then
          cycle
        end if
        ix = iy - aa%lag( ia)
        if ( adj) then
          a( ia) = a( ia) + y( iy) * x( ix)
        else
          y( iy) = y( iy) + a( ia) * x( ix)
        end if
      end do
    end do
  end subroutine
  subroutine hconest_close()
  end subroutine
end module