[ncl-talk] Editing a netcdf4 file

[David Brown]

Hi Dustin and Gerry,
I have confirmed there is a problem. It has been partially but not
completely fixed in the development version of the code. I am looking
into the remaining issue and will let you know when it has been fixed.
 -dave

On Tue, Jun 2, 2015 at 10:34 AM, Gerry Creager - NOAA Affiliate
<gerry.creager at noaa.gov> wrote:
> Additional information: If we do an addfile("<filename>","r"), we can open
> and read the file. If we use "w", well, we can open the file but assigning
> an existing variable to an internal variable fails on the assign (var =
> a->QRAIN). Of course, because it fails there, we can't see if it'd also fail
> on write.
>
> Thanks
> Gerry
>
> On Mon, Jun 1, 2015 at 7:15 PM, Gerry Creager - NOAA Affiliate
> <gerry.creager at noaa.gov> wrote:
>>
>> I've started looking at this with Dusty. Appreciate any thought you might
>> have as to why we're failing.
>>
>> I've uploaded the input file (wrfinput_d02) to the FTP incoming site. I'm
>> testing with the script:
>>
>> var = "QRAIN"
>> print(var)
>> a=addfile("wrfinput_d02.nc", "w")
>> var_orig=a->QRAIN
>> print(var_orig)
>>
>>
>> The result looks like:gerry at loki:~/NEWSe/NCL> ncl test.ncl
>>  Copyright (C) 1995-2015 - All Rights Reserved
>>  University Corporation for Atmospheric Research
>>  NCAR Command Language Version 6.3.0
>>  The use of this software is governed by a License Agreement.
>>  See http://www.ncl.ucar.edu/ for more details.
>>
>>
>> Variable: var
>> Type: string
>> Total Size: 8 bytes
>>             1 values
>> Number of Dimensions: 1
>> Dimensions and sizes: [1]
>> Coordinates:
>> (0) QRAIN
>> fatal:["NclNetCDF4.c":3073]:NclNetCDF4.c: Error in nc_def_var_chunking in
>> file (wrfinput_d02.nc) for writing, at line: 3073
>>
>> line 3074 of NclNetCDF4.c: NetCDF: Attempt to define var properties, like
>> deflate, after enddef.
>>
>>
>> On Fri, May 29, 2015 at 8:54 PM, Dustan Wheatley - NOAA Affiliate
>> <dustan.wheatley at noaa.gov> wrote:
>>>
>>> I am trying to overwrite a netcdf4 file analogous to what is shown at
>>> http://www.ncl.ucar.edu/Applications/change_netCDF.shtml.  In the attached
>>> ncl script, I open the file to be modified at line 35 and attempt the
>>> modification at line 73 (with a lot of calculations in between).  While I
>>> have double-checked that the modified field (var_mod) has the same
>>> dimensionality as the original variable (QRAIN), I am still get a
>>> segmentation fault/core dump.  Never had this problem when I tried to
>>> manipulate netcdf3 files.  Could it possibly be related to the netcdf4
>>> compression?  It’s possible I may be trying to do something that’s no longer
>>> possible.
>>>
>>> Thanks in advance for any suggestions.
>>>
>>> -Dusty Wheatley
>>>
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>>
>>
>>
>> --
>> Gerry Creager
>> NSSL/CIMMS
>> 405.325.6371
>> ++++++++++++++++++++++
>> “Big whorls have little whorls,
>> That feed on their velocity;
>> And little whorls have lesser whorls,
>> And so on to viscosity.”
>> Lewis Fry Richardson (1881-1953)
>
>
>
>
> --
> Gerry Creager
> NSSL/CIMMS
> 405.325.6371
> ++++++++++++++++++++++
> “Big whorls have little whorls,
> That feed on their velocity;
> And little whorls have lesser whorls,
> And so on to viscosity.”
> Lewis Fry Richardson (1881-1953)
>
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