[gradsusr] how to combine nc files with performing some arithmatics on the variable in these files

[曹宁]

Hi Waheed,

Maybe you can try this in a Grads Script :

'set fwrite ^prep.grd'
'set gxout fwrite'

i=1951
while(i<=2007)
'sdfopen ^**'i'**.nc'
……

You can take a yearly average here , and then there will be a file with 57
time steps.

Good luck!



2011/3/14 Waheed <waheed.met at gmail.com>

> Dear all
>
>  I have 57 nc files from 1951 to 2007 on monthly sum of precipitation for
> our region ( these files have one variable pptn). now i want to combine
> these files to get one file with 57 time steps such that t=1 shows the time
> 1957 and t=57 shows the time 2007 also i want to divide this sum in the
> final file with 57. how to do this any help.
>
> I have tried to combine these nc files through xconv software on RHL
> operating system it does not give any error while converting but when i go
> in and check the file it shows only one time step rather than 75 time steps.
> I have searched it on the Internet and got that CDO( climate data operator)
> can do it. but i am unable to install it and get it from net? how to do
> this? or is there any easy way to do this. because i have 57 files for each
> month ( i:e from January to December) .
>
> thanks to all in advance...
>
> Best regards
>
> --
> Waheed Iqbal
> Meteorologist
> Pakistan Meteorological Department
> R & D Division, Islamabad,Pakistan.
> +923334547814
>
>
>
>
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>


-- 
曹宁

MSN&Gmail&Gtalk：caoning1525 at gmail.com
安徽，合肥，China
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