Help: about short2flt

Dear Sir/Madam:
     I tried to convert short type array to float, with the following
command

  " filename = "amsr-avhrr-v2.20080910.nc"
      in = addfile(filename,"r")
     sst = in->sst(0,0,:,:)
     sst = (/short2flt(sst)/)
      sst = sst*0.01 "

The error is:

  Copyright (C) 1995-2009 - All Rights Reserved
  University Corporation for Atmospheric Research
  NCAR Command Language Version 5.1.1
  The use of this software is governed by a License Agreement.
  See http://www.ncl.ucar.edu/ for more details.
fatal:Undefined identifier: (short2flt) is undefined, can't continue
fatal:Execute: Error occurred at or near line 11 in file plot_sst.ncl

How to handle this problem?
Thank you very much!

BEST

Kekuan Chu
4/13/2010
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Received on Tue Apr 13 11:17:14 2010