;+
;
; @file_comments
; averages a 3- or 4-d time series field over a selected
; geographical area or along the time axis. For one or more
; selected axes (x, y, z, t)
;
; @categories
;
; @param TAB {in}{required}
; 3d or 4d field
;
; @param DIREC {in}{required}
; 'x' 'y' 'z' 't' 'xy' 'xz' 'yz' 'xyz' 'xt' 'yt' 'zt'
; 'xyt' 'xzt' 'yzt' or 'xyzt'
;
; @keyword BOXZOOM
; [xmin,xmax,ymin,ymax (,(zmin,)zmax)] to more details, see <pro>domdef</pro>
; boxzoom can have 5 forms :
; [vert2], [vert1, vert2],[lon1, lon2, lat1, lat2],
; [lon1, lon2, lat1, lat2, vert2],[lon1, lon2, lat1, lat2, vert1,vert2]
;
; @keyword NAN
; not a number, we activate it if we want to average without considerate some
; masked values of TAB.
; If masked values of TAB are values consecrated by IDL(!values.f_nan), we
; just have to put NAN.
; If masked values of TAB are valued a (a must be different of 1,
; corresponding to nan = !values.f_nan and of 0, which desactivate nan).
; We have to put NAN=a.
; Comment: In output, result points which are NAN will be valued a or
; !values.f_nan.
;
; @keyword NODOMDEF
; We activate it if we do not want to pass in <pro>domdef</pro> even if the 
; keyword boxzoom is present (like when <pro>grossemoyenne</pro> is called via 
; <pro>checkfield</pro>)
;
; @keyword INTEGRATION
; To make an integral rather than an average
;
; @keyword SPATIALFIRST
; when performing at the same time
; spatial and temporal mean, grossemoyenne is assuming
; that the mask is not changing with the time. In
; consequence, grossemoyenne performs temporal mean
; first and then call moyenne. Activate /SPATIALFIRST if
; you want to perform the spatial mean before the
; temporal mean. Note that if NAN is activated, then
; SPATIALFIRST is activated automatically.
;
; @keyword TEMPORALFIRST
; to force to perform first temporal
; mean even if NAN is activated (see SPATIALFIRST explanations...)
;
; @keyword WDEPTH
; to specify that the field is at W depth instead of T
; depth (automatically activated if vargrid eq 'W')
;
; @returns
; an array
;
; @uses
; <pro>common</pro>
; <pro>domdef</pro>
;
; @restrictions
; Put values corresponding to land at 1.e20
;
; @history
; Jerome Vialard (jv\@lodyc.jussieu.fr)
;			2/7/98
;                       Sebastien Masson (smasson\@lodyc.jussieu.fr)
; adaptation array containing a temporal dimension
;                       14/8/98
;                       15/1/98
;                       12/3/99 adaptation for NAN and utilization of TEMPORARY
;
; @version
; $Id$
;
;-
FUNCTION grossemoyenne, tab, direc, BOXZOOM=boxzoom, INTEGRATION=integration $
                      , NAN=nan, NODOMDEF=nodomdef, WDEPTH=wdepth $
                      , SPATIALFIRST=spatialfirst, TEMPORALFIRST=temporalfirst $
                      , _EXTRA=ex
;
  compile_opt idl2, strictarrsubs
;
@cm_4mesh
@cm_4data
@cm_4cal
  IF NOT keyword_set(key_forgetold) THEN BEGIN
@updatenew
@updatekwd
  ENDIF
;---------------------------------------------------------
  tempsun = systime(1)          ; For key_performance
;------------------------------------------------------------
;I) preliminaries
;------------------------------------------------------------
  dirt = 0
  dirx = 0
  diry = 0
  dirz = 0
  dim  = 'aa'
;------------------------------------------------------------
; I.1) Directions(s) we follow to integrate
;------------------------------------------------------------
  if ( strpos(direc, 't') ge 0 ) then dirt = 1
  if ( strpos(direc, 'x') ge 0 ) then dirx = 1
  if ( strpos(direc, 'y') ge 0 ) then diry = 1
  if ( strpos(direc, 'z') ge 0 ) then dirz = 1
  IF keyword_set(NAN) AND (dirx EQ 1 OR diry EQ 1 OR dirz EQ 1) $
    THEN spatialfirst = 1
  IF keyword_set(temporalfirst) THEN spatialfirst = 0
;------------------------------------------------------------
; I.2) verification of the input array's size
;------------------------------------------------------------
  taille = size(tab)
  case 1 of
    taille[0] eq 1 :return,  report('array has only one dimension, not implemented!')
    taille[0] eq 2 :return,  report('array has only two dimensions, not implemented!')
    taille[0] eq 3 :BEGIN
      dim = '3d'
      if dirx eq 0 and diry eq 0 and dirt eq 0 then return, tab
    END
    taille[0] eq 4 :BEGIN
      dim = '4d'
      if dirx eq 0 and diry eq 0 and dirz eq 0 and dirt eq 0 then return, tab
    END
    else : return, report('array must have 3 or 4 dimensions if there is not time dimension use moyenne')
  endcase
;------------------------------------------------------------
;   I.3) Obtainment of scale's factors and of the mask on the subdomain concernedby the average.
; Redefinition of the domain ajusted at boxzoom (at 6 elements)
; This will allowed us to calculate only in the domain concerned by the average.
; Domdef, followed by grid give us all arrays of the grid on the subdomain
;------------------------------------------------------------
  if keyword_set(boxzoom) then BEGIN
    Case 1 Of
      N_Elements(Boxzoom) Eq 1: bte = [lon1, lon2, lat1, lat2, 0., boxzoom[0]]
      N_Elements(Boxzoom) Eq 2: bte = [lon1, lon2, lat1, lat2, boxzoom[0], boxzoom[1]]
      N_Elements(Boxzoom) Eq 4: bte = [Boxzoom, vert1, vert2]
      N_Elements(Boxzoom) Eq 5: bte = [Boxzoom[0:3], 0, Boxzoom[4]]
      N_Elements(Boxzoom) Eq 6: bte = Boxzoom
      Else: return, report('Wrong Definition of Boxzoom')
    endcase
    if NOT keyword_set(nodomdef) then BEGIN
      savedbox = 1b
      saveboxparam, 'boxparam4grmoyenne.dat'
      domdef, bte, GRIDTYPE = vargrid, _extra = ex
    ENDIF
  ENDIF
;---------------------------------------------------------------
; attribution of the mask and of longitude and latitude arrays...
;---------------------------------------------------------------
  grille, mask, glam, gphi, gdep, nx, ny, nz, firstx, firsty, firstz, lastx, lasty, lastz, e1, e2, e3, WDEPTH = wdepth
;------------------------------------------------------------
; I.4) if dirt equal 1, we make the temporal average and we send it in moyenne
;------------------------------------------------------------
  if dirt EQ 1 AND NOT keyword_set(spatialfirst) then begin
    if dim EQ 3d then BEGIN
      case 1 of
        taille[1] eq jpi and taille[2] eq jpj and taille[3] eq jpt: $
          res = tab[firstx:firstx+nx-1 $
                    , firsty:firsty+ny-1, *]
        taille[1] EQ  nx and taille[2] eq  ny and taille[3] eq jpt:res = tab
        else:BEGIN
          if keyword_set(savedbox) THEN restoreboxparam, 'boxparam4grmoyenne.dat'
          return, report('Probleme d''adequation entre les tailles du domaine nx*ny*jpt '+strtrim(nx, 1)+'*'+strtrim(ny, 1)+'*'+strtrim(jpt, 1)+' et du tableau '+strtrim(taille[1], 1)+'*'+strtrim(taille[2], 1)+'*'+strtrim(taille[3], 1))
        END
      ENDCASE
      if keyword_set(integration) then begin
        res = total(res, 3, nan = nan)
      ENDIF ELSE BEGIN
        if keyword_set(nan) then BEGIN
          divi = finite(res)
          divi = total(temporary(divi), 3)
          notanum = where(divi EQ 0)
          res = total(res, 3, nan = keyword_set(nan))/ (1 > divi)
          if notanum[0] NE -1 then res[temporary(notanum)] = !values.f_nan
        ENDIF ELSE res = total(res, 3)/(1.*taille[3])
      ENDELSE
    ENDIF ELSE BEGIN
      case 1 of
        taille[1] eq jpi and taille[2] eq jpj and taille[3] eq jpk and taille[4] eq jpt: $
          res = tab[firstx:lastx, firsty:lasty, firstz:lastz, *]
        taille[1] eq jpi and taille[2] eq jpj and taille[3] eq nz and taille[4] eq jpt: $
          res = tab[firstx:lastx, firsty:lasty, *, *]
        taille[1] EQ  nx and taille[2] eq  ny and taille[3] eq nz and taille[4] eq jpt:res = tab
        taille[1] EQ  nx and taille[2] eq  ny and taille[3] eq jpk and taille[4] eq jpt: $
          res = tab[*, *, firstz:lastz, *]
        else:BEGIN
           if keyword_set(savedbox) THEN restoreboxparam, 'boxparam4grmoyenne.dat'
          return, report('Probleme d''adequation entre les tailles du domaine nx*ny*nz*jpt ' $
                         +strtrim(nx, 1)+'*'+strtrim(ny, 1)+'*'+strtrim(nz, 1)+'*' $
                         +strtrim(jpt, 1)+' et du tableau '+strtrim(taille[1], 1)+'*' $
                         +strtrim(taille[2], 1)+'*'+strtrim(taille[3], 1)+'*' $
                         +strtrim(taille[4], 1))
        END
        endcase
      if keyword_set(integration) then begin
        res = total(res, 4, nan = nan)
      ENDIF ELSE BEGIN
        if keyword_set(nan) then begin
          divi = finite(res)
          divi = total(temporary(divi), 4)
          notanum = where(divi EQ 0)
          res = total(res, 4, /nan)/(1 > divi)
          if notanum[0] NE -1 then res[temporary(notanum)] = !values.f_nan
        ENDIF ELSE res = total(res, 4)/(1.*taille[4])
      ENDELSE
    ENDELSE
    if keyword_set(savedbox) THEN restoreboxparam, 'boxparam4grmoyenne.dat'
    return,  moyenne(temporary(res), direc, BOXZOOM = boxzoom, NAN = nan, INTEGRATION = integration, NODOMDEF = nodomdef, WDEPTH = wdepth, _extra = ex)
  ENDIF ELSE res = tab
  IF jpt EQ 1 THEN BEGIN
    if keyword_set(savedbox) THEN restoreboxparam, 'boxparam4grmoyenne.dat'
    return, moyenne(reform(res, /over), direc, BOXZOOM = boxzoom, NAN = nan, INTEGRATION = integration, NODOMDEF = nodomdef, WDEPTH = wdepth, _extra = ex)
  END
;------------------------------------------------------------
;------------------------------------------------------------
; II) Case 2d arrays series (tab3d)
;------------------------------------------------------------
;------------------------------------------------------------
  if (dim eq '3d') then begin
;---------------------------------------------------------------
;   II.1) verification of the coherence of the array's size to average
; Verification of the coherence between the array's size and the domain defined by domdef
; The input array must have either the total domain's size (jpi,jpj,jpt) or
; this one of the reduced domain (nx,ny,jpt)
;---------------------------------------------------------------
    case 1 of
      taille[1] eq jpi and taille[2] eq jpj and taille[3] eq jpt: $
        res = tab[firstx:firstx+nx-1 $
                  , firsty:firsty+ny-1, *]
      taille[1] EQ  nx and taille[2] eq  ny and taille[3] eq jpt:res = tab
      else:BEGIN
        if keyword_set(savedbox) THEN restoreboxparam, 'boxparam4grmoyenne.dat'
        return, report('Probleme d''adequation entre les tailles du domaine nx*ny*jpt '+strtrim(nx, 1)+'*'+strtrim(ny, 1)+'*'+strtrim(jpt, 1)+' et du tableau '+strtrim(taille[1], 1)+'*'+strtrim(taille[2], 1)+'*'+strtrim(taille[3], 1))
      enD
    endcase
    if keyword_set(nan) NE 0 then BEGIN
      if nan NE 1 then BEGIN    ; If nan is not !values.f_nan
; we put it at !values.f_nan
        if abs(nan) LT 1e6 then notanumber = where(res EQ nan) $
        ELSE notanumber = where(abs(res) GT abs(nan)/10.)
        if notanumber[0] NE -1 then res[temporary(notanumber)] = !values.f_nan
      ENDIF
    ENDIF
;---------------------------------------------------------------
; Comment : WE HAVE TO BE CAREFUL ABOUT CASES WHERE THE DIMENSION TO
; AVERAGE = 1, AND MAKE SURE THAT IT EXIST. THAT IS WHY WE USE
; reform(...,nx,ny,...) WHICH CAN LOOK USELESS AT THE BEGINNING
;---------------------------------------------------------------
    if nx EQ 1 OR ny EQ 1 then BEGIN
      res = reform(res, nx, ny, jpt, /over)
      e1 =  reform(e1, nx, ny, /over)
      e2 =  reform(e2, nx, ny, /over)
    endif
    if nx EQ 1 OR ny EQ 1 OR nz EQ 1 THEN $
      mask =  reform(mask, nx, ny, nz, /over)
;---------------------------------------------------------------
; II.3) Different types of average
;---------------------------------------------------------------
    if keyword_set(nan) NE 0 then msknan = finite(res) ELSE msknan = -1
    mask = mask[*, *, 0]
    case 1 of
      (dirx eq 1) and (diry eq 0) : begin
        e = temporary(e1)*temporary(mask)
        echelle = (temporary(e))[*]#replicate(1, jpt)
        echelle = reform(echelle, nx, ny, jpt, /over)
        if keyword_set(integration) then divi = 1 ELSE BEGIN
          IF msknan[0] NE -1 THEN divi = total(echelle*msknan, 1) $
          ELSE divi = total(echelle, 1)
        ENDELSE
        res = total(temporary(res)*echelle, 1, nan = nan)/(divi > 1.)
        if msknan[0] NE -1 then BEGIN
          echelle = temporary(echelle) NE 0
          testnan = temporary(msknan)*echelle
          testnan = total(temporary(testnan), 1) $
            +(total(temporary(echelle), 1) EQ 0)
        endif
      end
      (dirx eq 0) and (diry eq 1) : begin
        e = temporary(e2)*temporary(mask)
        if nx EQ 1 OR ny EQ 1 then e = reform(e, nx, ny, /over)
        echelle = (temporary(e))[*]#replicate(1, jpt)
        echelle = reform(echelle, nx, ny, jpt, /over)
        if keyword_set(integration) then divi = 1 ELSE BEGIN
          IF msknan[0] NE -1 THEN divi = total(echelle*msknan, 2) $
          ELSE divi = total(echelle, 2)
        ENDELSE
        res = total(temporary(res)*echelle, 2, nan = nan)/(divi > 1.)
        if msknan[0] NE -1 then begin
          echelle = temporary(echelle) NE 0
          testnan = temporary(msknan)*echelle
          testnan = total(temporary(testnan), 2) $
            +(total(temporary(echelle), 2) EQ 0)
        endif
      end
      (dirx eq 1) and (diry eq 1) : begin
        echelle = (temporary(e1)*temporary(e2)*temporary(mask))[*]#replicate(1, jpt)
        echelle = reform(echelle, nx, ny, jpt, /over)
        if keyword_set(integration) then divi = 1 ELSE BEGIN
          IF msknan[0] NE -1 THEN divi = total(total(echelle*msknan, 1), 1) $
          ELSE divi = total(total(echelle, 1), 1)
        ENDELSE
        res = total(temporary(total(temporary(res)*echelle, 1, nan = nan)), 1, nan = nan)/(divi > 1.)
        if msknan[0] NE -1 then begin
          echelle = temporary(echelle) NE 0
          testnan = temporary(msknan)*echelle
          testnan = total(total(temporary(testnan), 1), 1) $
            +(total(total(temporary(echelle), 1), 1) EQ 0)
        endif
      end
    endcase
  endif
;------------------------------------------------------------
;------------------------------------------------------------
; III) Case 3d arrays series (tab4d)
;------------------------------------------------------------
  if (dim eq '4d') then begin
;---------------------------------------------------------------
; III.1) Verification of the coherence of the array to average size
; Verification of the coherence between the array's size and the domain
; defind by domdef
; The input array must have either the total domain size (jpi,jpj,jpk,jpt)
; or this one of the reduced domain (nx,ny,ny,jpt)
;---------------------------------------------------------------
    case 1 of
      taille[1] eq jpi and taille[2] eq jpj and taille[3] eq jpk and taille[4] eq jpt: $
        res = tab[firstx:lastx, firsty:lasty, firstz:lastz, *]
      taille[1] eq jpi and taille[2] eq jpj and taille[3] eq nz and taille[4] eq jpt: $
        res = tab[firstx:lastx, firsty:lasty, *, *]
      taille[1] EQ  nx and taille[2] eq  ny and taille[3] eq nz and taille[4] eq jpt:res = tab
      taille[1] EQ  nx and taille[2] eq  ny and taille[3] eq jpk and taille[4] eq jpt: $
        res = tab[*, *, firstz:lastz, *]
      else:BEGIN
        if keyword_set(savedbox) THEN restoreboxparam, 'boxparam4grmoyenne.dat'
        return, report('Probleme d''adequation entre les tailles du domaine nx*ny*nz*jpt ' $
                       +strtrim(nx, 1)+'*'+strtrim(ny, 1)+'*'+strtrim(nz, 1)+'*' $
                       +strtrim(jpt, 1)+' et du tableau '+strtrim(taille[1], 1)+'*' $
                       +strtrim(taille[2], 1)+'*'+strtrim(taille[3], 1)+'*' $
                       +strtrim(taille[4], 1))
      END
    endcase
    if nx EQ 1 OR ny EQ 1 OR nz EQ 1 OR jpt EQ 1 then res = reform(res, nx, ny, nz, jpt, /over)
    if keyword_set(nan) NE 0 then BEGIN
      if nan NE 1 then BEGIN    ; if nan is not !values.f_nan
; we put it at !values.f_nan
        if abs(nan) LT 1e6 then notanumber = where(res EQ nan) $
        ELSE notanumber = where(abs(res) GT abs(nan)/10.)
        if notanumber[0] NE -1 then res[temporary(notanumber)] = !values.f_nan
      ENDIF
    ENDIF
;---------------------------------------------------------------
; Comment : WE HAVE TO BE CAREFUL ABOUT CASES WHERE THE DIMENSION TO
; AVERAGE = 1, AND MAKE SURE THAT IT EXIST. THAT IS WHY WE USE
; reform(...,nx,ny,...) WHICH CAN LOOK USELESS AT THE BEGINNING
;---------------------------------------------------------------
    if nx EQ 1 OR ny EQ 1 OR nz EQ 1 then BEGIN
      res = reform(res, nx, ny, nz, jpt, /over)
      mask =  reform(mask, nx, ny, nz, /over)
    ENDIF
    IF keyword_set(key_partialstep) THEN BEGIN
; the top of the ocean floor is
      IF vargrid EQ 'T' OR vargrid EQ 'W' THEN bottom = total(mask, 3) $
      ELSE bottom = total(tmask[firstx:lastx, firsty:lasty, firstz:lastz], 3)
; we suppress columns with only ocean or land
      good = where(bottom NE 0 AND bottom NE nz)
; the bottom of the ocean in 3D index is:
      bottom = lindgen(nx*ny)+(temporary(bottom)-1L)*nx*ny
      IF good[0] NE -1 THEN bottom = bottom[good] $
      ELSE bottom = -1
    ENDIF ELSE bottom = -1
;---------------------------------------------------------------
; III.2) different average types
;---------------------------------------------------------------
    IF keyword_set(nan) NE 0 THEN msknan = finite(res) ELSE msknan = -1
    case 1 of
      (dirx eq 1) and (diry eq 0) and (dirz eq 0) : BEGIN
        e13 = (temporary(e1))[*]#replicate(1., nz)
        e13 = reform(e13, nx, ny, nz, /over)
        echelle = (temporary(e13)*temporary(mask))[*]#replicate(1, jpt)
        echelle = reform(echelle, nx, ny, nz, jpt, /over)
        IF keyword_set(key_partialstep) AND bottom[0] NE -1 $
          AND nx NE 1 THEN BEGIN
          IF msknan[0] EQ -1 THEN BEGIN
            msknan = replicate(1b, nx, ny, nz, jpt)
            nan = 1
          ENDIF
          bottom = bottom#replicate(1, jpt) $ ; 4D bottom!
            + replicate(1, n_elements(bottom))#(nx*ny*nz*lindgen(jpt))
          msknan[bottom] = 0
          res[temporary(bottom)] = !values.f_nan
        ENDIF
        if keyword_set(integration) then divi = 1 ELSE begin
          IF msknan[0] NE -1 THEN divi = total(echelle*msknan, 1) $
          ELSE divi = total(echelle, 1)
        endelse
        res = temporary(res)*echelle
        res = total(temporary(res), 1, nan = nan)/(divi > 1)
        if msknan[0] NE -1 then begin
          echelle = temporary(echelle) NE 0
          testnan = temporary(msknan)*echelle
          testnan = total(temporary(testnan), 1) $
            +(total(temporary(echelle), 1) EQ 0)
        endif
      end
      (dirx eq 0) and (diry eq 1) and (dirz eq 0) : begin
        e23 = temporary(e2[*])#replicate(1., nz)
        e23 = reform(e23, nx, ny, nz, /over)
        echelle = (temporary(e23)*temporary(mask))[*]#replicate(1, jpt)
        echelle = reform(echelle, nx, ny, nz, jpt, /over)
        IF keyword_set(key_partialstep) AND bottom[0] NE -1 $
          AND ny NE 1 THEN BEGIN
          IF msknan[0] EQ -1 THEN BEGIN
            msknan = replicate(1b, nx, ny, nz, jpt)
            nan = 1
          endif
          bottom = bottom#replicate(1, jpt) $ ; 4D bottom!
            + replicate(1, n_elements(bottom))#(nx*ny*nz*lindgen(jpt))
          msknan[bottom] = 0
          res[temporary(bottom)] = !values.f_nan
        ENDIF
        if keyword_set(integration) then divi = 1 ELSE begin
          IF msknan[0] NE -1 THEN divi = total(echelle*msknan, 2) $
          ELSE divi = total(echelle, 2)
        endelse
        res = total(temporary(res)*echelle, 2, nan = nan)/(divi > 1)
        if msknan[0] NE -1 then begin
          echelle = temporary(echelle) NE 0
          testnan = temporary(msknan)*echelle
          testnan = total(temporary(testnan), 2) $
            +(total(temporary(echelle), 2) EQ 0)
        endif
      end
      (dirx eq 0) and (diry eq 0) and (dirz eq 1) : begin
        e33 = replicate(1, 1.*nx*ny)#e3
        e33 = reform(e33, nx, ny, nz, /over)
        IF keyword_set(key_partialstep) AND bottom[0] NE -1 THEN BEGIN
          IF keyword_set(wdepth) THEN $
            e33[bottom] = (e3w_ps[firstx:lastx, firsty:lasty])[temporary(good)] $
          ELSE e33[bottom] = (e3t_ps[firstx:lastx, firsty:lasty])[temporary(good)]
        ENDIF
        echelle = (temporary(e33)*temporary(mask))[*]#replicate(1, jpt)
        echelle = reform(echelle, nx, ny, nz, jpt, /over)
        if keyword_set(integration) then divi = 1 ELSE begin
          IF msknan[0] NE -1 THEN divi = total(echelle*msknan, 3) $
          ELSE divi = total(echelle, 3)
        endelse
        res = total(temporary(res)*echelle, 3, nan = nan)/(divi > 1)
        if msknan[0] NE -1 then begin
          echelle = temporary(echelle) NE 0
          testnan = temporary(msknan)*echelle
          testnan = total(temporary(testnan), 3) $
            +(total(temporary(echelle), 3) EQ 0)
        endif
      end
      (dirx eq 1) and (diry eq 1) and (dirz eq 0) : begin
        e13 = e1[*]#replicate(1., nz)
        e13 = reform(e13, nx, ny, nz, /over)
        e23 = e2[*]#replicate(1., nz)
        e23 = reform(e23, nx, ny, nz, /over)
        echelle = (temporary(e13)*temporary(e23)*temporary(mask))[*]#replicate(1, jpt)
        echelle = reform(echelle, nx, ny, nz, jpt, /over)
        IF keyword_set(key_partialstep) AND bottom[0] NE -1 $
          AND nx*ny NE 1 THEN BEGIN
          IF msknan[0] EQ -1 THEN BEGIN
            msknan = replicate(1b, nx, ny, nz, jpt)
            nan = 1
          endif
          bottom = bottom#replicate(1, jpt) $ ; 4D bottom!
            + replicate(1, n_elements(bottom))#(nx*ny*nz*lindgen(jpt))
          msknan[bottom] = 0
          res[temporary(bottom)] = !values.f_nan
        ENDIF
        if keyword_set(integration) then divi = 1 ELSE begin
          IF msknan[0] NE -1 THEN divi = total(total(echelle*msknan, 1), 1) $
          ELSE divi = total(total(echelle, 1), 1)
        endelse
        res = total(total(temporary(res)*echelle, 1, nan = nan), 1, nan = nan)/(divi > 1)
        if msknan[0] NE -1 then begin
          echelle = temporary(echelle) NE 0
          testnan = temporary(msknan)*echelle
          testnan = total(total(temporary(testnan), 1), 1) $
            +(total(total(temporary(echelle), 1), 1) EQ 0)
        endif
      end
      (dirx eq 1) and (diry eq 0) and (dirz eq 1) : begin
        e133 = e1[*]#e3
        IF keyword_set(key_partialstep) AND bottom[0] NE -1 THEN BEGIN
          IF keyword_set(wdepth) THEN $
            e133[bottom] = (e1*e3w_ps[firstx:lastx, firsty:lasty])[temporary(good)] $
          ELSE e133[bottom] = (e1*e3t_ps[firstx:lastx, firsty:lasty])[temporary(good)]
        ENDIF
        echelle = (temporary(e133[*])*temporary(mask[*]))#replicate(1, jpt)
        echelle = reform(echelle, nx, ny, nz, jpt, /over)
        if keyword_set(integration) then divi = 1 ELSE begin
          IF msknan[0] NE -1 THEN divi = total(total(echelle*msknan, 1), 2) $
          ELSE divi = total(total(echelle, 1), 2)
        endelse
        res = total(total(temporary(res)*echelle, 1, nan = nan), 2, nan = nan)/(divi > 1)
        if msknan[0] NE -1 then begin
          echelle = temporary(echelle) NE 0
          testnan = temporary(msknan)*echelle
          testnan = total(total(temporary(testnan), 1), 2) $
            +(total(total(temporary(echelle), 1), 2) EQ 0)
        endif
      end
      (dirx eq 0) and (diry eq 1) and (dirz eq 1) : begin
        e233 = e2[*]#e3
        IF keyword_set(key_partialstep) AND bottom[0] NE -1 THEN BEGIN
          IF keyword_set(wdepth) THEN $
            e233[bottom] = (e2*e3w_ps[firstx:lastx, firsty:lasty])[temporary(good)] $
          ELSE e233[bottom] = (e2*e3t_ps[firstx:lastx, firsty:lasty])[temporary(good)]
        ENDIF
        echelle = (temporary(e233[*])*temporary(mask[*]))#replicate(1, jpt)
        echelle = reform(echelle, nx, ny, nz, jpt, /over)
        if keyword_set(integration) then divi = 1 ELSE begin
          IF msknan[0] NE -1 THEN divi = total(total(echelle*msknan, 2), 2) $
          ELSE divi = total(total(echelle, 2), 2)
        endelse
        res = total(total(temporary(res)*echelle, 2, nan = nan), 2, nan = nan)/(divi > 1)
        if msknan[0] NE -1 then begin
          echelle = temporary(echelle) NE 0
          testnan = temporary(msknan)*echelle
          testnan = total(total(temporary(testnan), 2), 2) $
            +(total(total(temporary(echelle), 2), 2) EQ 0)
        endif
      end
      (dirx eq 1) and (diry eq 1) and (dirz eq 1) : begin
        e1233 = (e1[*]*e2[*])#e3
        IF keyword_set(key_partialstep) AND bottom[0] NE -1 THEN BEGIN
          IF keyword_set(wdepth) THEN $
            e1233[bottom] = (e1*e2*e3w_ps[firstx:lastx, firsty:lasty])[temporary(good)] $
          ELSE e1233[bottom] = (e1*e2*e3t_ps[firstx:lastx, firsty:lasty])[temporary(good)]
        ENDIF
        echelle = (temporary(e1233[*])*temporary(mask[*]))#replicate(1, jpt)
        echelle = reform(echelle, nx, ny, nz, jpt, /over)
        if keyword_set(integration) then divi = 1 ELSE begin
          IF msknan[0] NE -1 THEN divi = total(total(total(echelle*msknan, 1), 1), 1) $
          ELSE divi = total(total(total(echelle, 1), 1), 1)
        endelse
        res = total(total(total(temporary(res)*echelle, 1, nan = nan), 1, nan = nan), 1, nan = nan)/(divi > 1)
        if msknan[0] NE -1 then begin
          echelle = temporary(echelle) NE 0
          testnan = temporary(msknan)*echelle
          testnan = total(total(total(temporary(testnan), 1), 1), 1) $
            +(total(total(total(temporary(echelle), 1), 1), 1) EQ 0)
        endif
      end
    endcase
  endif
;------------------------------------------------------------
  if dirt EQ 1 AND keyword_set(spatialfirst) then BEGIN
    IF (reverse(size(res, /dimension)))[0] NE jpt THEN BEGIN
      ras = report('the last dimension of res is not equal to jpt: '+strtrim(jpt, 2))
      if keyword_set(savedbox) THEN restoreboxparam, 'boxparam4grmoyenne.dat'
      return, -1
    ENDIF
    tdim = size(res, /n_dimensions)
    if keyword_set(integration) then res = total(res, tdim, nan = nan) $
    ELSE BEGIN
      if keyword_set(nan) then BEGIN
        testnan = testnan < 1
        testnan = total(temporary(testnan), tdim)
        divi = testnan
      ENDIF ELSE divi = jpt
      res = total(res, tdim, nan = nan)/(1 > divi)
    ENDELSE
  ENDIF
;------------------------------------------------------------
;------------------------------------------------------------
;IV ) finishing
;------------------------------------------------------------
;------------------------------------------------------------
; IV.1) We mask land by a value equal to 1.e+20
;------------------------------------------------------------
  valmask = 1e+20
  terre = where(divi EQ 0)
  IF terre[0] NE -1 THEN BEGIN
    res[temporary(terre)] = 1e+20
  ENDIF
;------------------------------------------------------------
; IV.2) We replace, when nan equal 1, !values.f_nan by nan
;------------------------------------------------------------
  if keyword_set(nan) NE 0 then BEGIN
    puttonan = where(temporary(testnan) EQ 0)
    if puttonan[0] NE -1 then res[temporary(puttonan)] = !values.f_nan
    if nan NE 1 then BEGIN
      notanumber = where(finite(res) eq 0)
      if notanumber[0] NE -1 then res[temporary(notanumber)] = nan
    ENDIF
  ENDIF
;------------------------------------------------------------
; IV.3) We replace in the domain whch was defined at the entry of average
;------------------------------------------------------------
  if keyword_set(savedbox) THEN restoreboxparam, 'boxparam4grmoyenne.dat'
;------------------------------------------------------------
  if keyword_set(key_performance) THEN print, 'temps grossemoyenne', systime(1)-tempsun
  return, res
;------------------------------------------------------------
;------------------------------------------------------------
end