[gradsusr] GrADS convert longitude west to east

[Tracey]

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​
>>>
>>>
>>> _______________________________________________
>>> gradsusr mailing listgradsusr at gradsusr.orghttp://gradsusr.org/mailman/listinfo/gradsusr
>>>
>>>
>>>
>>> _______________________________________________
>>> gradsusr mailing list
>>> gradsusr at gradsusr.org
>>> http://gradsusr.org/mailman/listinfo/gradsusr
>>>
>>>
>>
>> _______________________________________________
>> gradsusr mailing list
>> gradsusr at gradsusr.org
>> http://gradsusr.org/mailman/listinfo/gradsusr
>>
>>
>
> _______________________________________________
> gradsusr mailing list
> gradsusr at gradsusr.org
> http://gradsusr.org/mailman/listinfo/gradsusr
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://gradsusr.org/pipermail/gradsusr/attachments/20180712/a632d75c/attachment.html>