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[Heiner Körnich]

Dear Anastasia,

you can try the ave command with a time shift:
c set time to the full length
'set t 1 100'
c ave over the previous 4 and next 4 hours= average over centered 9 hours
'define meanconc=tloop(ave(conc,t-4,t+4))'
c or average over the next 8 hours
'define meanconc2=tloop(ave(conc,t+0,t+8))'

Parakallo,

Heiner



Anastasia Poupkou wrote:

> Dear all,
>
> I would like to calculate using GRADS Daily Max *Rolling* *8h* mean
> concentrations of a pollutant. Have you got any suggestion?
>
> Thank you,
>
> Anastasia


--
Heiner Körnich
Dept. of Meteorology                    Tel:    +46 8 164333
Stockholms University
SE-106 91 Stockholm, Sweden             Email:  heiner at misu.su.se