[gradsusr] Maximum Updraft Velocity in Previous Hour

[L.B.]

A much simpler solution that I came across years ago was that GrADS only
recognizes variables name with 15 or fewer characters. So, I just used the
same variable but only typed out the first 15 characters of the variable
name and it worked for me. In your case,  'd MAXUVV400_1000mb'  would
become:  'd MAXUVV400_1000m' . Try that and see if it works.

*-------*
William (L.B.) LaForce IV
Meteorologist


On Wed, Jul 3, 2019 at 6:45 AM Moustabchir Rachid <
rachid.moustabchir at gmail.com> wrote:

> Dear grads users!
>
> After a long search in google I found that a solution was already given in
> your website. It is an issue related to  the fact that grads does not
> support long variable names. To solve it: I provided in control file an
> "alias" variable name that follows grads rules like:
> MAXUVV400_1000mb=>MAXUVV400
> So I use the following commands to create this alias:
>
> $* cat *201104270600_wrfout_arw_d01.ctl*  | sed
> 's/MAXUVV400_1000mb/MAXUVV400_**1000mb=>MAXUVV400/g' > *
> new_wrfout_arw_d01.ctl
> $ mv new_wrfout_arw_d01.ctl    201104270600_wrfout_arw_d01.ctl
>
> In this case if we look inside * 201104270600_wrfout_arw_d01.ctl*, we get:
>
>
> *MAXUVV400_1000mb=>MAXUVV400* 0,108,40000,100000 0,2,220,2 ** 400-1000 mb
> above ground Hourly Maximum Of Upward Vertical Velocity In The Lowest
> 400hPa [m/s]
>
>
>  This mean that the alias between the two variables was done correctly,
> and in the script I use  'd MAXUVV400' instead of 'd MAXUVV400_1000mb'
>
> Thanks.
> Rachid
>
> On Mon, 24 Jun 2019 at 20:31, Moustabchir Rachid <r.moustabchir at uiz.ac.ma>
> wrote:
>
>> Dear Sir!
>>
>> When I try to plot Maximum Updraft Velocity in Previous Hour with a
>> script using 'd MAXUVV400_1000mb' , grads return an error:
>>
>> Syntax Error: Invalid Operand
>>
>> 'maxuvv400_1000mb' not a variable or function name
>>
>> Error ocurred at column 1
>>
>> DISPLAY error: Invalid expression
>>
>> Expression = maxuvv400_1000mb
>>
>>
>> in the index file of the grib2 file I can find the MAXUVV400_1000mb
>> varible:
>> MAXUVV400_1000mb 0,108,40000,100000 0,2,220,2 ** 400-1000 mb above ground
>> Hourly Maximum Of Upward Vertical Velocity In The Lowest 400hPa [m/s]
>>
>>
>> Thanking you most sincerely for your time and consideration.
>>
>>
>> Cordially,
>>
>>
>>
>> Dr. Rachid Moustabchir
>>
>> Ibn Zohr University
>>
>> Agadir Morocco
>>
>>
>> _______________________________________________
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>
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