[gradsusr] GrADS convert longitude west to east

[Tracey]

Hi Bill,

I've actually solved the issue by taking out the quotations altogether, so
I no longer need help!  Thanks very much for your suggestions though.

Sincerely,
Tracey

On Fri, Jul 13, 2018 at 11:34 AM, Bill Bua - NOAA Affiliate <
bill.bua at noaa.gov> wrote:

> Hi Tracey --
>
> Those quotations seem  to be in the right place, and you have the right
> syntax to do your debugging (print out using say lonmine, etc.). Did you
> check to make sure that lonmin and lonmax are what you expect?
>
> B
>
> Dr. William R. (Bill) Bua
> UCAR/COMET/NCEP/EMC
> 5830 University Research Court #2784
> College Park, MD 20740
>
>
> On Thu, Jul 12, 2018 at 1:08 PM, Tracey <tdorian10 at gmail.com> wrote:
>
>> Hi Bill,
>>
>> Thanks for your response!  I'm still a little bit confused though.  I am
>> passing into the script a grid, for example:
>>
>> grads -lc "script.gs 25 50 -130 -60"
>>
>> Where 25 and 50 are latmin and latmax, and -130 and -60 are lonmin and
>> lonmax.  It is necesary in my GrADS script to use both degrees east and
>> degrees west longitude.
>>
>> So in my GrADS script, is there a way to just do something like the
>> following in the bold red color?
>>
>> function main(arg)
>> latmin=subwrd(arg,1)
>> latmax=subwrd(arg,2)
>> lonmin=subwrd(arg,3)
>> lonmax=subwrd(arg,4)
>> ....
>> 'set lat 'latmin' 'latmax
>> 'set lon 'lonmin' 'lonmax
>> *'define lonmine = 360 - 'lonmin*
>> *'define lonmaxe = 360 - 'lonmax*
>> *say lonmine*
>> *say lonmaxe*
>>
>> The above in red doesn't seem to work and I'm not sure why.  Maybe I have
>> quotations in the wrong places?
>>
>> Thanks,
>> Tracey
>>
>> On Thu, Jul 12, 2018 at 7:39 AM, Bill Bua - NOAA Affiliate <
>> bill.bua at noaa.gov> wrote:
>>
>>> Hi Tracey --
>>>
>>> There's a difference between a script variable and what I believe is
>>> called an *intrinsic* variable, in GrADS. With script variables, you
>>> would indeed use "define".  But for intrinsic variables (and this from my
>>> experience needs to be in a script), I believe you'd have to pull the
>>> values from a string of display-ed data.  That is:
>>>
>>> "d lon"
>>> lonw = subwrd(result,<leftmost character position>, <rightmost character
>>> position>)
>>>
>>> where leftmost and rightmost refer to the left and right position in the
>>> line that includes the variable lonw.
>>> If there are multiple lines in the display, you'll have to first choose
>>> the line that contains the longitude. If it were the 2nd line, you'd have
>>> the command
>>>
>>> lonline=sublin(result, 2)
>>> then do subwrd(lonline, <leftmost>,<rightmost>) as above.
>>>
>>> Finally, you'd define your lone = 360 - lonw ("define lone = 360 -
>>> lonw").
>>>
>>> I'm doing this from memory ... it's been awhile since I wrote a script.
>>> I'll check it out once I'm where I can write a test script and see if this
>>> works.
>>>
>>> Bill
>>>
>>>
>>>
>>> Dr. William R. (Bill) Bua
>>> UCAR/COMET/NCEP/EMC
>>> 5830 University Research Court #2784
>>> College Park, MD 20740
>>>
>>>
>>> On Wed, Jul 11, 2018 at 6:49 PM, Tracey <tdorian10 at gmail.com> wrote:
>>>
>>>> ​Hi Bill,
>>>>
>>>> Thanks, how would I use this arithmetic in the GrADS script with
>>>> 'lonmax' and 'lonmin' arguments?  This is what I'm having trouble with.
>>>>  Would I use "define"?
>>>>
>>>> Sincerely,
>>>> Tracey
>>>>
>>>> On Wed, Jul 11, 2018 at 6:31 PM, Bill Reilly <
>>>> bill_reilly at compuserve.com> wrote:
>>>>
>>>>> 360 - degW = degE
>>>>>
>>>>> --
>>>>>
>>>>> Bill Reilly
>>>>>
>>>>> (+34) 686-110-748
>>>>> bill at passageweather.comwww.passageweather.com
>>>>> bill at brwebworks.comwww.brwebworks.com
>>>>>
>>>>> On 12/07/2018 00:14, Tracey wrote:
>>>>>
>>>>> ​Hi GrADS users,
>>>>>
>>>>> Is there a GrADS function or script that converts degrees west
>>>>> longitude into degrees east?  For example, if I input "lonmin" and "lonmax"
>>>>> arguments into a GrADS script and I wanted to convert those longitudes from
>>>>> degrees west to degrees east within the script by defining new "lonmin" and
>>>>> "lonmax" variables?
>>>>>
>>>>> Thanks in advance for any help,
>>>>> Tracey​
>>>>>
>>>>>
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