vector_series.f90

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module vector_series
  use vector, only : vector_t
  implicit none
  private
 
  type, public :: vector_series_t
     type(vector_t), pointer :: v => null()
     type(vector_t), allocatable :: lv(:)
     integer, private :: len = 0
   contains
     procedure, pass(this) :: init => vector_series_init
     procedure, pass(this) :: free => vector_series_free
     procedure, pass(this) :: update => vector_series_update
     procedure, pass(this) :: set => vector_series_set
     procedure, pass(this) :: size => vector_series_size
  end type vector_series_t
 
  type, public :: vector_series_ptr_t
     type(vector_series_t), pointer :: ptr => null()
  end type vector_series_ptr_t
 
contains
 
  subroutine vector_series_init(this, v, len)
    class(vector_series_t), intent(inout) :: this
    type(vector_t), intent(inout), target :: v
    integer :: len
    character(len=80) :: name
    character(len=5) :: id_str
    integer :: i
 
    call this%free()
 
    this%v => v
    this%len = len
 
    allocate(this%lv(len))
 
    do i = 1, this%len
       write(id_str, '(I0)') i
       name = trim(this%v%name)//'_lag'//id_str
       call this%lv(i)%init(this%v%size(), name)
    end do
 
  end subroutine vector_series_init
 
  subroutine vector_series_free(this)
    class(vector_series_t), intent(inout) :: this
    integer :: i
 
    if (associated(this%v)) then
       nullify(this%v)
    end if
 
 
    if (allocated(this%lv)) then
       do i = 1, this%len
          call this%lv(i)%free()
       end do
 
       deallocate(this%lv)
    end if
 
  end subroutine vector_series_free
 
  function vector_series_size(this) result(len)
    class(vector_series_t), intent(in) :: this
    integer :: len
    len = this%len
  end function vector_series_size
 
  subroutine vector_series_update(this)
    class(vector_series_t), intent(inout) :: this
    integer :: i
 
    do i = this%len, 2, -1
       this%lv(i) = this%lv(i-1)
    end do
 
    this%lv(1) = this%v
 
  end subroutine vector_series_update
 
  subroutine vector_series_set(this, g)
    class(vector_series_t), intent(inout) :: this
    type(vector_t), intent(in) :: g
    integer :: i
 
    do i = 1, this%len
       this%lv(i) = g
    end do
 
  end subroutine vector_series_set
 
end module vector_series