[ncl-talk] request

[ali mughal]

Dear NCL users

In the attached script all values of TA_Average are equal to 0.

But when I individually calculate t2a_sub2_avg and t2b _sub2_avg and
evaluate the difference then the values are not 0. Can any one tell me what
could be the reason and how to write the output correctly in to a csv or a
text format.

I will be grateful for the support.
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b=addfile("wrfout_d05_2016-03-31_00:00:00","r")
a=addfile("../../wrfout_d05_2016-03-31_00:00:00","r")

lat2d = wrf_user_getvar(a,"XLAT", 0)
lon2d = wrf_user_getvar(a,"XLONG",0)
min_lat = 1.281
max_lat = 1.296
min_lon = 103.629
max_lon = 103.643



;t2 at _FillValue    = default_fillvalue(typeof(t2))
lon2d at _FillValue = default_fillvalue(typeof(lon2d))
lat2d at _FillValue = default_fillvalue(typeof(lat2d))

lats = (/ min_lat, max_lat /)
lons = (/ min_lon, max_lon /)
 loc  = wrf_user_ll_to_ij(a, lons, lats, True)
 loc  = loc-1


  ilt1 = loc(1,0)
  ilt2 = loc(1,1)
  iln1 = loc(0,0)
  iln2 = loc(0,1)

  lat_sub2 = lat2d(ilt1:ilt2 , iln1:iln2)
  lon_sub2 = lon2d(ilt1:ilt2 , iln1:iln2)
 ntimes = dimsizes(times)


do it = 0,ntimes-1


  TA_MEAN_IND   = wrf_user_getvar(a,"TA_MEAN",it)
  t2a=TA_MEAN_IND(0,:,:)
  TA_MEAN_NO_IND   = wrf_user_getvar(b,"TA_MEAN",it)
  t2b=TA_MEAN_IND(0,:,:)


  t2a at _FillValue    = default_fillvalue(typeof(t2a))

  t2a_sub2  = t2a                     ; make a copy
  t2a_sub2  = t2a_sub2 at _FillValue     ; set to all missing
  t2a_sub2(ilt1:ilt2,iln1:iln2) = t2a(ilt1:ilt2, iln1:iln2)

  t2a_sub2_avg = avg(t2a_sub2)


  t2b at _FillValue    = default_fillvalue(typeof(t2b))

  t2b_sub2  = t2b                     ; make a copy
  t2b_sub2  = t2b_sub2 at _FillValue     ; set to all missing
  t2b_sub2(ilt1:ilt2,iln1:iln2) = t2b(ilt1:ilt2, iln1:iln2)

  t2b_sub2_avg = avg(t2b_sub2)

  T_avg=t2a_sub2_avg-t2b_sub2_avg
print ("time="+times(it)+"   TA_Average="+T_avg)

end do