[ncl-talk] Running average

[Soma Roy]

Thank you very much.

Soma

On Tue, Dec 4, 2018, 04:05 Dennis Shea <shea at ucar.edu wrote:

> Better:
>
> navg        = 5
> xRunAvg = ...
> nStrt        = navg/2
> xBlock_5 = xRunAvg(nStrt::navg,:,:)
>
> navg        = 7
> xRunAvg = ...
> nStrt        = navg/2
> xBlock_7 = xRunAvg(nStrt::navg,:,:)
>
> On Mon, Dec 3, 2018 at 3:19 PM Dennis Shea <shea at ucar.edu> wrote:
>
>> Hi Soma,
>>
>> What you want are *block* 5-day and 7-day averages. EG: *"73* times for
>> a *365* day series."
>> It is your responsibility to be clear on your objective.
>> Otherwise, people spend their valuable time trying to figure out what you
>> want.
>>
>> x(time, lat, lon)     .... (ntim,nlat,mlon)
>>      0      1    2     <=== dimension numbers [ Please read NCL
>> documentation]
>>
>> Two approaches:
>>
>> [1]
>>
>>    endopt = ... ; -1, 0, 1   PLEASE read the documentation
>>    ndim_time = 0
>>
>>    navg = 5
>>    xRunAvg = *runave_n_Wrap
>> <http://www.ncl.ucar.edu/Document/Functions/Contributed/runave_n_Wrap.shtml>(*x,
>> navg, endopt, ndim_time)  ; classic running average (ntim,nlat,mlon)
>>    xBlock_5 = xRunAvg(::navg,:,:)
>>    printVarSummary(xBlock_5)
>>
>>    navg = 7
>>    xRunAvg = *runave_n_Wrap
>> <http://www.ncl.ucar.edu/Document/Functions/Contributed/runave_n_Wrap.shtml>(*x,
>> navg, endopt, ndim_time)  ; classic running average (ntim,nlat,mlon)
>>    xBlock_7 = xRunAvg(::navg,:,:)
>>    printVarSummary(xBlock_7)
>>
>> [2]
>>
>> *http://www.ncl.ucar.edu/Document/Functions/Contributed/calculate_segment_values.shtml*
>> <http://www.ncl.ucar.edu/Document/Functions/Contributed/calculate_segment_values.shtml>
>>
>> This requires that 'time' have CF conforming units. I suggest you use [1].
>>
>> On Mon, Dec 3, 2018 at 2:27 PM Soma Roy <somaroy892 at gmail.com> wrote:
>>
>>> Hello,
>>>
>>> I used the example 2 from the below link;
>>> https://www.ncl.ucar.edu/Document/Functions/Built-in/runave_n.shtml
>>>
>>> But there is no change in output time dimension.
>>> I used 365 days data over nlat x nlon as input.
>>>
>>> I set nave=5 with expectation to get nlat x nlon for 73 times in output.
>>>
>>> But there is no change in output dimensions. Then how to extract 5 days
>>> running avg. over 365 days dataset?
>>>
>>> Kindly inform me.
>>>
>>> Thanking you,
>>> Soma
>>>
>>> On Mon, Dec 3, 2018, 21:10 Soma Roy <somaroy892 at gmail.com wrote:
>>>
>>>> Thanks for the hints
>>>>
>>>> Soma
>>>>
>>>> On Mon, Dec 3, 2018, 19:21 Appo derbetini <appopson4 at gmail.com wrote:
>>>>
>>>>> Hi,
>>>>> I think that you easily do it with
>>>>> *https://www.ncl.ucar.edu/Document/Functions/Built-in/runave_n.shtml
>>>>> <https://www.ncl.ucar.edu/Document/Functions/Built-in/runave_n.shtml>*
>>>>>
>>>>> Regards
>>>>>
>>>>> Le lun. 3 déc. 2018 à 10:54, Soma Roy <somaroy892 at gmail.com> a écrit :
>>>>>
>>>>>> Thank you.
>>>>>> Efficient way to do.
>>>>>>
>>>>>> But I would like to know also the steps for this by using ncl.
>>>>>>
>>>>>> Thanks,
>>>>>> Soma
>>>>>>
>>>>>> On Mon, Dec 3, 2018, 15:14 Oluwaseun Ilori <wilseun at gmail.com wrote:
>>>>>>
>>>>>>> Cdo will do it easily and better
>>>>>>>
>>>>>>> cdo -timselmean,5 infile outfile
>>>>>>>
>>>>>>>
>>>>>>> On Mon, Dec 3, 2018, 10:36 AM Soma Roy <somaroy892 at gmail.com wrote:
>>>>>>>
>>>>>>>> Hello,
>>>>>>>>
>>>>>>>> I am using daily gridded rainfall datasets.
>>>>>>>> I want to compute 5 days and 7 days running avg. of rainfall from
>>>>>>>> the datasets over each grid points.
>>>>>>>>
>>>>>>>> Structure of the input file is like below;
>>>>>>>>
>>>>>>>> Rain (730, 129, 135)  ; (time (365*2), lat, lon)
>>>>>>>>
>>>>>>>> Please kindly inform me which function should I use in this case.
>>>>>>>>
>>>>>>>> Thanking you,
>>>>>>>> Soma
>>>>>>>>
>>>>>>>>
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