ZDEF

[Mateus da Silva Teixeira]

No, I can't. The on-line documentation was very recently updated, but in
the documentation that comes with the new version of the GrADS there is
this information
(file:///home/mateus/grads-1.9b4/doc/descriptorfile.html#ZDEF):

" The LINEAR mapping method requires two additional arguments: /start/
and /increment/. /start/ is a floating point value that indicates the
longitude at grid point Z=1. /increment/ is the spacing between grid
point values in the Z direction, or from lower to higher. /increment/
may be a negative value."

with the example

"ZDEF 10 LINEAR 1000 -100
  ZDEF 7 LEVELS 1000 850 700 500 300 200 100
  ZDEF 17 LEVELS 1000 925 850 700 600 500 400 300 250 200 150 100 70 50"

Mateus

Matthias Munnich escreveu:
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> Mateus da Silva Teixeira wrote:
>
>> By the way, if it should not be used, why it continues into the on-line
>> GrADS documentation? Remember that GrADS have a lot of new users that
>> use intensively that documentation and the experienced users use
>> that as
>> reference.
>>
>>
> Can you point to the documentation where a negative increment is used,
> so that
> Jennifer can correct it?
>
> ... Matt
>
>
>
>> Jennifer M. Adams escreveu:
>>
>>> If you must use 'ZDEF linear', try this:
>>> ZDEF 19 linear 100 50
>>> OPTIONS zrev
>>>
>>> What's wrong with the 'ZDEF 19 levels ...' option you wrote out?
>>> Why complain when you've got something that works?
>>>
>>> The bugs regarding bad ZDEF entries were in the older versions that
>>> allowed a negative or zero increment. Non-positive grid increments
>>> cause problems in a few different places in the code, places you might
>>> not necessarily visit during a normal GrADS session.
>>>
>>> Jennifer
>>>
>>> On Oct 30, 2006, at 11:41 AM, Mateus da Silva Teixeira wrote:
>>>
>>>
>>>> Dear GrADS users,
>>>>
>>>> I'm not sure if it is a bug or is a problem with my CTL files, but
>>>> always that try to use negative increments in ZDEF, like
>>>> ZDEF 19 LINEAR 1000 -50
>>>> I get the following error:
>>>>
>>>> Open Error:  Missing or invalid dimension increment value
>>>>  --> The invalid description file record is:
>>>>  --> ZDEF 19 LINEAR 1000 -50
>>>>
>>>>  The data file was not opened.
>>>>
>>>> But when replace the above ZDEF line by this
>>>> ZDEF 19 LEVELS 1000 950 900 850 800 750 700 650
>>>>            600 550 500 450 400 350 300 250 200
>>>>            150 100
>>>>
>>>>
>>>> It works. I'm using the version v1.9b4 32-bit. However, when using
>>>> the
>>>> version v1.8s11, any error do occur with negative increment in the
>>>> CTL file.
>>>> Is this a bug of the new version?
>>>>
>>>> Thanks
>>>>
>>>> Mateus
>>>>
>>>>
>>>>
>>>> _______________________________________________________
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>>>>
>>> Jennifer M. Adams
>>> IGES/COLA
>>> 4041 Powder Mill Road, Suite 302
>>> Beltsville, MD 20705
>>> jma at cola.iges.org <mailto:jma at cola.iges.org>
>>>
>>>
>>>
>>>
>>
>>
>>
>>
>> _______________________________________________________
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>
>
> - --
> - --------------------------------
> Matthias Munnich
> Univ. of California, Los Angeles
> Inst. of Geophysics and Planetary Physics
> 3845 Slichter Hall
> Los Angeles, CA 90095-1567
> Phone: +1-310-794 5899
> Fax: +1-310-206 3051
> Email: munnich at atmos.ucla.edu
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