!-------------------------------------- LICENCE BEGIN ------------------------------------
!Environment Canada - Atmospheric Science and Technology License/Disclaimer,
!                     version 3; Last Modified: May 7, 2008.
!This is free but copyrighted software; you can use/redistribute/modify it under the terms
!of the Environment Canada - Atmospheric Science and Technology License/Disclaimer
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!

SUBROUTINE oda_res 3,2
  use modmask, only : lmask, ldiag
   USE modfgat,only : istepobs,nstart,nend,nobs 
  implicit none
  !
  !Purpose:
  !Compute residuals to observations for assimilated and diagnosed data
  !  Modify ROBDATA8(NCMOMA,*) in place :
  !  NCMOMA contains Hdx as input and residuals as output
  !
  !Author  : S. Pellerin *ARMA/MRB January 2009
  !
  !Revision:
  ! L. Fillion, ARMA/EC, 5 Jun 2009. Introduce 1 Obs experiment.
 
  !     Bin He   - ARMA/MRB   - Oct. 2011,
  !              - 4Dvar optimization.

  !
#include "comdim.cdk"
#include "comdimo.cdk"
#include "comoabdy.cdk"
#include "comoahdr.cdk"
#include "comoba.cdk"
#include "comcva.cdk"
#include "com1obs.cdk"
#include "cvcord.cdk"

  !Local Declarations

  integer jdata,jfle 
!
!!
  if(l1obs) then
    ROBDATA8(NCMOMA,1) = ROBDATA8(NCMOMA,1)-R1OBSINO
  else
    IF(nobs(istepobs)==0) RETURN
    DO jfle=1,NFILES 
      DO JDATA=nstart(istepobs,jfle),nend(istepobs,jfle)
       IF (lmask(jdata).or.ldiag(jdata)) THEN
          ROBDATA8(NCMOMA,JDATA) = ROBDATA8(NCMOMA,JDATA)-ROBDATA8(NCMVAR,JDATA)
       ENDIF
      ENDDO 
    ENDDO 
  endif
!
  return
END SUBROUTINE oda_res