Undefined identifier: (center_finite_diff_n) is undefined, can't continue

Dear Ncl users,

Please help me find out the problem in my code!

   1. I run NCL 5.1.1

   1. The shortest NCL script possible that illustrates the bug. RED is
   where error comes!

load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/wrf/WRFUserARW.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/wrf/WRF_contributed.ncl"

begin

  f = addfile
("/import/wrkdir1/asemenov/WRF/WRFV3/case_study_30_km/wrfout_d01_2011-03-15_00:00:00"+".nc",
"r")
  fout = addfile ("eady.nc","c")

  res = True
; !!!!!!!!!!!!!! here come resources !!!!!!!!!!!!!!!!
  times = chartostring(f->Times)
  ntim = dimsizes(times)

  print ("Creating array...")
  temp = f->T
  egr = temp
  egr@_FillValue = -999.
  egr = egr@_FillValue
  egr@description = "eady growth rate"
  egr@units = "s-1"
  delete(temp)

 do nt=0,ntim-1
 print (times(nt))

res@tiMainString = times(nt)

; get coriolis
;--------------------------------------------------------------------
  cor = f->F(nt,:,:)
  printVarSummary (cor)
  ;printMinMax (cor,True)

; get theta, wind and z
;--------------------------------------------------------------------
  z = wrf_user_getvar(f,"z",nt)
  t = wrf_user_getvar(f,"theta",nt)
  u = wrf_user_getvar(f,"ua",nt)
  v = wrf_user_getvar(f,"va",nt)
  speed = (u*u + v*v)^0.5
  copy_VarCoords (u,speed)

  lv=0
  x=233
  y=228
  print("T: "+t(lv,x,y)+" Z: "+z(lv,x,y))

; calculate vertical gradients dtdz and dudz
;--------------------------------------------------------------------
  dtdz = center_finite_diff_n(t,z,False,0,0)
  dtdz@_FillValue = -999.
  dtdz = where ( dtdz .lt. 10e-3, dtdz@_FillValue, dtdz)
  copy_VarCoords (t,dtdz)
  ;printVarSummary (dtdz)
  ;printMinMax (dtdz,True)

  do lv=0,31
  print("T: "+t(lv,x,y)+" Z: "+z(lv,x,y)+" dTdZ: "+dtdz(lv,x,y))
  end do

3) The exact error message is

fatal:Undefined identifier: (center_finite_diff_n) is undefined, can't
continue
fatal:Execute: Error occurred at or near line 150 in file EADY2.ncl

4) The type of system you're on (usually "uname -a" is enough).
Linux pacman1 2.6.18-238.19.1.563g0000.el5 #1 SMP Fri Jul 15 20:26:36 EDT
2011 x86_64 x86_64 x86_64 GNU/Linux

-
regards

*******************************************************
*Alexander Semenov*
PhD Student - Research Assistant
International Arctic Research Center
Department of atmospheric sciences
University of Alaska Fairbanks

-- 
regards
*******************************************************
*Alexander Semenov*
PhD Student - Research Assistant
International Arctic Research Center
Department of atmospheric sciences
University of Alaska Fairbanks

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Received on Wed Jan 4 16:11:00 2012