if/endif use with defined variables

[Davide Sacchetti]

operators like '>' work for just numbers, not for fields ...
I mean: 5>4 is correct, while vmerId >= 5.0 (pay attention to the
missing 'I' in your script) is not correct: if you want to compare
fields to numbers use maskout function.

Also if vmerid is a single value field, grads thinks it is a "field": to
retrive the value you may use "query defval vmerid" or simply "display
vmerid" and then parse 'result' using subwrd function.

hoping I could help
Bye bye
Davide

On Fri, 2010-04-02 at 09:10 -0300, Eduardo Agosta Scarel wrote:
> Hello Matt and Grads' Users,
> 
> 
> you are righ and I am sorry for the mistake. I wrote a quick script as
> an example.
> 
> 
> The corrected way is:
> 
> 
> j=1
> i=0
> while (j < 31)
> 'set t 27'
> 'set lat 0'
> 'set lon 0 360'
> 'define vmerid=ave(vwnd(t='j'), lat=0, lat=10)'
> v='vmerid'
> if (vmerd >= 5.0 & vmerid <= 5.0)
>    i=i+1
> endif
> j=j+1
> endwhile
> 
> 
> Anyway that is not the problem. 
> What I want to do is to evaluate every value obtained for the defined
> vmerid variable against the thresholds in order to count those cases.
> 
> 
> Thank you for your help.
> 
> 
> Eduardo.
> 
> 
> 
> 
> 2010/4/2 Matt Alonso <matt.alonso at gmail.com>
>         I might be missing something but it doesn't look like j will
>         ever be anything other than 1. Is that what you are intending
>         to do? 
>         
>         Sent from my Verizon Wireless BlackBerry
>         
>         
>         ______________________________________________________________
>         From: Eduardo Agosta Scarel <eduardo.agosta at GMAIL.COM>
>         Date: Fri, 2 Apr 2010 08:50:23 -0300
>         To: <GRADSUSR at LIST.CINECA.IT>
>         Subject: if/endif use with defined variables
>         
>         
>         
>         Hi you all!
>         
>         
>         I am trying to use the values obtained for a defined variable
>         within an if/endif construction, but it appears that the
>         script does not read in fact every value (which must be
>         compared with a certain threshold).
>         
>         
>         Any suggestion for that?
>         
>         
>         I will much appreciate.
>         
>         
>         Eduardo.
>         
>         
>         
>         
>         PS: E.g. of what I want to do: to count the numbers of days
>         when the defined variable is below or over a threshold:
>         
>         
>         j=1
>         i=0
>         while (j < 31)
>         'set t 27'
>         'set lat 0'
>         'set lon 0 360'
>         'define vmerid=ave(vwnd(t='j'), lat=0, lat=10)'
>         v='vmerid'
>         if (vmerd >= 5.0 & vmerid <= 5.0)
>            i=i+1
>         endif
>         enwhile
>         
>         
>         
>         
>         -- 
>         
>         eduardo.agosta at conicet.gov.ar
>         eduardo_agosta at uca.edu.ar
>         
> 
> 
> 
> -- 
> Eduardo Agosta Scarel
> 
> eduardo.agosta at conicet.gov.ar
> eduardo_agosta at uca.edu.ar
> 


-- 
Sacchetti Davide
Centro Funzionale Meteo Idrologico di Protezione Civile della Regione Liguria
ARPAL Unità Tecnica Complessa di livello Regionale
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