3hourly data to daily data

[John Guhin]

Hi,
       I was wondering if someone can find the mistake. I am trying to
convert a 3 hourly data to daily data.
The original data is 3D.  any help will be appreciated.
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* Program to write 3 hourly data to daily data
'reinit'
'c'
'set gxout fwrite'
'set fwrite u_daily.dat'
'open u.ctl'
'set lon 40 180'
'set lat -10 10'
'set lev 850'
t1=1
while(t1<977)
'set t 't1
'd ave(u,t=t1,t=t1+7)'
t1=t1+8
endwhile
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