[gradsusr] regriding daily data to pentadal

[Jennifer Adams]

Hi, Ismaila,
This is basically a regridding operation in the time dimension. The  
only way to do this is the brute-force method of stepping through your  
daily time series, averaging five time steps together, and writing out  
the results to a new data file. You will have to decide what to do  
with the extra day in the case of a leap year. Your script might look  
something like this:

'set gxout fwrite'
'set fwrite -ap pentad.bin'
tlast=365
t=1
while (t<tlast)
   'set t 't
   'd ave(var,t+0,t+4)'
   t=t+5
endwhile
'disable fwrite'

--Jennifer


On Feb 22, 2011, at 8:00 AM, Ismaila Diallo wrote:

> Dear grads user,
> I have daily data in netcdf format and i went to transform them in  
> pentadal data (cumul for every 5 day : example 1to 5, 6 to 10 ....).  
> Does it a way for doing these transformation in grads.
> all suggestions are welcome.
> Thanks in advance
> ismaila
>
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> gradsusr at gradsusr.org
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--
Jennifer M. Adams
IGES/COLA
4041 Powder Mill Road, Suite 302
Calverton, MD 20705
jma at cola.iges.org



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