Re: [ferret_users] seasonal average...

[Willi Rath <wrath@xxxxxxxxxxxxx>]

Seontae,
>   14-NOV-2002 / 635:  1.528
>   15-DEC-2002 / 636:  1.499
>   14-JAN-2003 / 637:  0.937
>   14-FEB-2003 / 638:  0.538
>   16-MAR-2003 / 639:  0.388
>    
The following uses the above time series, linearly (?) interpolates it 
to your grid and then computes the average for the time span Dec 15 ... 
Feb 15. So it will use half of the box around Dec 15, half of the box 
around Feb 14, and all of the box around Jan 14 which approximately 
amounts to

(0.5*1.499 + 1.0*0.937 + 0.5*0.538) / (0.5 + 1.0 + 0.5) ~ 0.978
> list nino3[t=15-dec-2002:15-feb-2003@ave]
>               VARIABLE : NINO3
>               FILENAME : nino4_nino3.dat
>               TIME     : 15-DEC-2002 00:00 to 15-FEB-2003 00:00 (averaged)
>            0.9760
>    
Here, the full boxes around Dec 15 and Feb 14 are used:

(1.0*1.499 + 1.0*0.937 + 1.0*0.538) / (1.0 + 1.0 + 1.0) ~ 0.991
> list nino3[l=636:638@ave]
>               VARIABLE : NINO3
>               FILENAME : nino4_nino3.dat
>               TIME     : 30-NOV-2002 04:43 to 01-MAR-2003 12:11 (averaged)
>            0.9911
Willi