[gradsusr] extracting problem

[Kishore Ragi]

Please be clear about what you want to plot. You mean DJF seasonal mean? If
you want for one year, you may go like below

d (var(t=1)+var(t=2)+var(t=12))/3

Regards,
Kishore


*PhD student in climate science,*

*National Institute of Technology, Rourkela,*

*India- 769008*





*Phone: +91-8908671881http://www.researchgate.net/profile/Kishore_Ragi
<http://www.researchgate.net/profile/Kishore_Ragi>https://in.linkedin.com/in/kishoreragi
<https://in.linkedin.com/in/kishoreragi>*

On Tue, Aug 29, 2017 at 6:34 PM, Sanjukta Rani Padhi <
sanjuktapadhi87 at gmail.com> wrote:

> can I know the codes  to plot a DJF  (december, january, february) from a
> .nc file. thanks.
>
> On Tue, Aug 29, 2017 at 6:32 PM, Sanjukta Rani Padhi <
> sanjuktapadhi87 at gmail.com> wrote:
>
>> yes it help. thank you sir.
>>
>>
>> On Tue, Aug 29, 2017 at 6:07 PM, Kishore Ragi <kishoreragi at gmail.com>
>> wrote:
>>
>>> Technically, there is no difference between cdo and grads to extract.
>>> Output should be same!
>>>
>>> However, you can get separated files for each year with grads. You only
>>> have to select x and y for each year that you want.
>>>
>>> Then you can combine the separated years using cdo as the following
>>>
>>> cdo mergetime file1.nc file2.nc file3.nc all.nc
>>>
>>> But, I prefer using cdo command.
>>>
>>> cdo selyear,2002,2004,2007 2000-2013.nc 200220042007.nc
>>>
>>> hope this helps!
>>>
>>> Regards,
>>> Kishore
>>>
>>>
>>> *PhD student in climate science,*
>>>
>>> *National Institute of Technology, Rourkela,*
>>>
>>> *India- 769008*
>>>
>>>
>>>
>>>
>>>
>>> *Phone: +91-8908671881
>>> <+91%2089086%2071881>http://www.researchgate.net/profile/Kishore_Ragi
>>> <http://www.researchgate.net/profile/Kishore_Ragi>https://in.linkedin.com/in/kishoreragi
>>> <https://in.linkedin.com/in/kishoreragi>*
>>>
>>> On Tue, Aug 29, 2017 at 5:55 PM, Sanjukta Rani Padhi <
>>> sanjuktapadhi87 at gmail.com> wrote:
>>>
>>>> Thanks sir for the commands. In CDO the ploting map is not clear ,
>>>> thats why i prefer to use Grads.
>>>> but if my years are not serialy means x to y is not serial, then how i
>>>> set.
>>>> if i want 2002, 2004, 2007 from 2000-2013.nc data set. kindly help.
>>>>
>>>>
>>>> On Tue, Aug 29, 2017 at 5:42 PM, Kishore Ragi <kishoreragi at gmail.com>
>>>> wrote:
>>>>
>>>>> Hi,
>>>>>
>>>>> You can use cdo to extract data from th large file.
>>>>>
>>>>> use the following command
>>>>>
>>>>> cdo selyear,2010,2011,2012,etc inputfile.nc outfile.nc
>>>>>
>>>>> or if you want to stick to grads and want to extract few years, here
>>>>> are the steps you should take
>>>>>
>>>>> sdfopen yourfile.nc
>>>>> set t x y
>>>>> define var=var
>>>>> set sdfwrite subset.nc
>>>>> sdfwrite var
>>>>>
>>>>> where x and y are initial and final timestep you want in your required
>>>>> subset file.
>>>>>
>>>>> This clearly shows that the former process is much easier. If I were
>>>>> you, I would use cdo to accomplish as I am bit lazy.
>>>>>
>>>>> Cheers,
>>>>> Kishore
>>>>>
>>>>>
>>>>> *PhD student in climate science,*
>>>>>
>>>>> *National Institute of Technology, Rourkela,*
>>>>>
>>>>> *India- 769008*
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> *Phone: +91-8908671881
>>>>> <+91%2089086%2071881>http://www.researchgate.net/profile/Kishore_Ragi
>>>>> <http://www.researchgate.net/profile/Kishore_Ragi>https://in.linkedin.com/in/kishoreragi
>>>>> <https://in.linkedin.com/in/kishoreragi>*
>>>>>
>>>>> On Tue, Aug 29, 2017 at 5:24 PM, Sanjukta Rani Padhi <
>>>>> sanjuktapadhi87 at gmail.com> wrote:
>>>>>
>>>>>> Hi All,
>>>>>> I am new in Grads. I want to know how to extract some years from a
>>>>>> .nc file having some large no of years.
>>>>>> thanks
>>>>>>
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>>>>>>
>>>>>>
>>>>>
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>>>>>
>>>>
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>>>
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>>
>
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