[gradsusr] (no subject)

[James T. Potemra]

You will have to set the time range before defining variable 'a', 
otherwise it will only be defined for a single time step.  Try add 'set 
t 1 81' before defining 'a'.

Jim

On 5/8/21 8:42 AM, Evgeny Gavrilov wrote:
> "i" from while.
>
> maps = 20
>   i = 1
>   while ( i<maps )
> 'set t ' i
>
> 2) a-a(t=1) also has a report about constant field (value=0)
>
> 'reinit'
>
> 'sdfopen 
> https://nomads.ncep.noaa.gov/dods/gfs_0p25/gfs20210508/gfs_0p25_12z 
> <https://nomads.ncep.noaa.gov/dods/gfs_0p25/gfs20210508/gfs_0p25_12z>'
>
> 'set mpdset hires'
> 'set lon 10 30'
> 'set lat 40 50'
>
> 'set display color white'
>
> 'set gxout shaded'
> 'define a = tmp2m'
> 'd a-a(t-1)'
> 'cbarm'
>
> 'printim C:\Users\for\temp.png x800 y600'
>
> 'clear'
>
> return
>
> On Sat, May 8, 2021 at 10:11 PM Jeff Duda <jeffduda319 at gmail.com 
> <mailto:jeffduda319 at gmail.com>> wrote:
>
>     1a) How is 'i' set?
>     1b) I don't think the grads scripting language supports math in a
>     command line command like that. You'd have to do something like
>     i = 1
>     i2 = i-1
>     'd a(t='i') - a(t='i2')'
>
>     2) This command is equivalent and does not require a script
>     variable (provided your dimension environment is set
>     appropriately): 'd a - a(t-1)'
>
>     Jeff Duda
>
>     On Sat, May 8, 2021 at 12:01 PM Evgeny Gavrilov
>     <eugen420 at gmail.com <mailto:eugen420 at gmail.com>> wrote:
>
>         why this method does not working?
>
>         'set gxout shaded'
>         'define a=tmp2m'
>         'd a(t='i') - a(t='i-1')'
>
>         report: constant field. value = 0
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>
>
>
>     -- 
>     Jeff Duda, Research Scientist
>     University of Colorado Boulder
>     Cooperative Institute for Research in Environmental Sciences
>     NOAA/OAR/ESRL/Global Systems Laboratory
>     Boulder, CO
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