da_jo_and_grady_ssmt1.inc

1 subroutine da_jo_and_grady_ssmt1(iv, re, jo, jo_grad_y)
2 
3    !-----------------------------------------------------------------------
4    ! Purpose: TBD
5    !-----------------------------------------------------------------------
6 
7    implicit none
8 
9    type (ob_type), intent(in)   :: iv          ! Innovation vector.
10    type (y_type), intent(in)    :: re          ! Residual vector.
11    type (y_type), intent(inout) :: jo_grad_y   ! Grad_y(Jo)
12    type (jo_type), intent(inout):: jo          ! Obs cost function.
13 
14    integer                      :: n, k
15 
16    jo % ssmt1_t = 0.0
17 
18    if (iv%num_ssmt1 > 0) then
19    
20       do n=1, iv%num_ssmt1
21          do k=1, iv%ssmt1(n)%info%levels
22 
23             jo_grad_y%ssmt1(n)%t(k) = -re%ssmt1(n)%t(k) / &
24                                       (iv%ssmt1(n)%t(k)%error * &
25                                         iv%ssmt1(n)%t(k)%error)
26 
27             jo % ssmt1_t = jo % ssmt1_t - &
28                            re%ssmt1(n)%t(k) * jo_grad_y%ssmt1(n)%t(k)
29          end do
30       end do
31 
32       jo % ssmt1_t = 0.5 * jo % ssmt1_t
33 
34    end if
35 
36 end subroutine da_jo_and_grady_ssmt1
37 
38