Displaying Compound Variables

[Jason Snyder]

I tried the following with no success:

'sdfopen uwnd.2001.nc'
'sdfopen vwnd.2001.nc'
'set gxout shaded'
'set t 1'
'define uwnd=uwnd(t=1)'
i=2
count=1
While(i<5)
    count=count+1
    say count
   'set t 'i
   uwnd = uwnd - uwnd(i-1)
*    V.count=vwnd.2
*   'd U.count'
    i=i+1
endwhile
what am I doing wrong here?

Thanks,

Jason
On Mon, Feb 1, 2010 at 8:39 PM, Jeffrey Duda <jdduda at iastate.edu> wrote:

> No.  Compounds only work for internal variables and you can't display
> them.  there's a difference between a displayable product/field and an
> internal variable that is used in calculations.
>
> If you want to make a field that is the sum of that field in previous
> times, you'll have to code it like that, but you can do it with a while loop
> in such a way:
>
> 'define product = product(first time)'
> while (time step counter variable condition is true)
>  product '=' product '-' product'(t-'time step counter variable')'
> endwhile
>
> 'd 'product
>
> Each time the code goes through the loop, the previous time step of the
> field will be taken away from the current one, starting with the latest in
> time.
>
> Jeff Duda
>
>
> On Mon, Feb 1, 2010 at 6:55 PM, Jason Snyder <jmssnyder at ucdavis.edu>wrote:
>
>> I have a script to produce compound variables:
>>
>> 'sdfopen uwnd.2001.nc'
>> 'set gxout shaded'
>> 'set t 1'
>> 'define U=uwnd'
>> i=1
>> count=1
>> While(i<5)
>>     count=count+1
>>     say count
>>    'set t 'i
>>    U.count=uwnd
>>     i=i+1
>> endwhile
>> the compound variable is U.count.  How do I go about producing and
>> displaying compound variables?
>> What modifications must I make to the script.
>>
>> What I want to make a formula that would be like this
>> U(t)=U(t)+U(t-1)+U(t-2).  Where t-1 is a time step earlier than t and t-2 is
>> two timesteps earlier than t.  I want to have this formula work for
>> steptimes from 1 to say 5 (set t 1 5) How do I go about doing this?  Are
>> compound variables event the answer?
>>
>> Thanks,
>>
>> Jason
>>
>>
>>
>
>
>
> --
> Jeff Duda
> Iowa State University
> Meteorology Graduate Student
> 3134 Agronomy Hall
> www.meteor.iastate.edu/~jdduda
>
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