Is there a bug for NCL 5.1.0?

Dear everyone,

I have a list of NetCDF files, like

1948-09.nc
1948-10.nc
1948-11.nc
1948-12.nc

and I'd like to open them by addfiles function, and then write them to one file. The script is like the follow,
+++++++++++++++++++
;*************************************************
; NCL tutorial script: vert_1.ncl
;************************************************
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/csm/contributed.ncl"
;************************************************
begin
;************************************************
; file handling
;************************************************
   fns = systemfunc("ls 1948-??.nc")
   in = addfiles(fns,"r") ; open netcdf file
   ListSetType(in,"cat") ;specify type of merge
 
   system("rm -f ./test.nc")
   ncdf=addfile("test.nc","c") ;out put file
   ncdf->time=in[:]->time
 
   print(in[:]->time)
   print(ncdf->time)
end
+++++++++++++++++++

When I run this script under the environment of NCL 5.0.0, the output information is

 Copyright (C) 1995-2007 - All Rights Reserved
 University Corporation for Atmospheric Research
 NCAR Command Language Version 5.0.0
 The use of this software is governed by a License Agreement.
 See http://www.ncl.ucar.edu/ for more details.
(0) 30
(1) 61
(2) 91
(3) 122
 
 
Variable: time (file variable)
Type: double
Total Size: 32 bytes
            4 values
Number of Dimensions: 1
Dimensions and sizes: [ncl0 | 4]
Coordinates:
Number Of Attributes: 0
(0) 30
(1) 61
(2) 91
(3) 122

but under the environment of NCL 5.1.0, it is

 Copyright (C) 1995-2009 - All Rights Reserved
 University Corporation for Atmospheric Research
 NCAR Command Language Version 5.1.0
 The use of this software is governed by a License Agreement.
 See http://www.ncl.ucar.edu/ for more details.
 
 
Variable: time (file variable)
Type: double
Total Size: 32 bytes
            4 values
Number of Dimensions: 1
Dimensions and sizes: [time | 4]
Coordinates:
            time: [ 30.. 122]
Number Of Attributes: 2
  long_name : time
  units : days since 1948-09-01 00:00:00
(0) 30
(1) 61
(2) 91
(3) 122
 
 
Variable: time (file variable)
Type: double
Total Size: 32 bytes
            4 values
Number of Dimensions: 1
Dimensions and sizes: [time | 4]
Coordinates:
            time: [ 30.. 30]
Number Of Attributes: 2
  long_name : time
  units : days since 1948-09-01 00:00:00
(0) 30
(1) 30
(2) 30
(3) 30

The problem is that the assignment fails in NCL 5.1.0 but succeeds in NCL 5.0.0, so why? Is that a bug?

Thanks in advance.

Best Regards

Xuguang

2009-3-23
===================================
SUN Xuguang

School of Atmospheric Sciences, Nanjing University
22 Hankou Road, Nanjing 210093
China
Tel: +86-025-83597203 (O)
Email: sunxg007_at_yahoo.com.cn

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Received on Sun Mar 22 2009 - 23:53:23 MDT