[ncl-talk] same data but different spatial pattern

[Toni Klemm]

Hi Jamal,

It looks like your do loop in your first attempt does not average. You’re simply replacing the first dimension in TRMM with the next dataset every time you repeat the loop. That’s why your first and second plot look so different. 

In your second attempt you're copying the entire first dimension and then average, that’s why it looks different. If you mean to do that (average the first dimension), your second attempt seems fine.

I hope that makes sense.

Toni


Toni Klemm, Ph.D.
Postdoctoral Research Associate
Department of Ecosystem Science and Management
College of Agriculture and Life Sciences
Texas A&M University, College Station, TX
Contributor to the Early Career Climate Forum <http://www.eccforum.org/>
www.toni-klemm.de <http://www.toni-klemm.de/> | @toniklemm <http://twitter.com/toniklemm>








> On Feb 12, 2019, at 2:20 PM, Md. Jalal Uddin <dmjalal90 at gmail.com> wrote:
> 
>  Hi all, 
> When I did loop over time, I got a spatial figure that I did not expect (dd_loop figure). 
> f = addfile("bob_dd.nc <https://urldefense.proofpoint.com/v2/url?u=http-3A__bob-5Fdd.nc&d=DwMFaQ&c=ODFT-G5SujMiGrKuoJJjVg&r=WsLJ5ywbW3XnTzqo_ETV62H6s1a5bcGgnrpl7xPRfic&m=00Y6K5t3WswGmNOO6WFFhxReMcZp10_pqq3Gh_aSm1c&s=1UQT6wjQp2nsSrxV7rcEPkMkD2C2aMAPttXb-3HRnnw&e=>","r")
> do i =0,2443
>   TRMM = f->pcp(i,{0:30},{65:110})        
>  end do
> 
> I got the right spatial pattern when I did dimension average (dd_avg figure). 
> f = addfile("bob_dd.nc <https://urldefense.proofpoint.com/v2/url?u=http-3A__bob-5Fdd.nc&d=DwMFaQ&c=ODFT-G5SujMiGrKuoJJjVg&r=WsLJ5ywbW3XnTzqo_ETV62H6s1a5bcGgnrpl7xPRfic&m=00Y6K5t3WswGmNOO6WFFhxReMcZp10_pqq3Gh_aSm1c&s=1UQT6wjQp2nsSrxV7rcEPkMkD2C2aMAPttXb-3HRnnw&e=>","r")
> TRMM = f->pcp(:,{0:30},{65:110})          
>  dd_ave = dim_avg_n_Wrap(TRMM,0)
> 
> How can I get similar spatial pattern? What is the difference between time loop and dimension average? Could you explain, please? 
> 
> Jalal
> -- 
> Md. Jalal Uddin
> MSc in Applied Meteorology (English Language)
> Nanjing University of Information, Science and Technology, China
> B.Sc. in Disaster Management (Hons.) 
> Patuakhali Science and Technology University, Bangladesh.
> Cell: +8613260859092, +8801792052662
> Web: www.dmjalal90.weebly.com <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.dmjalal90.weebly.com&d=DwMFaQ&c=ODFT-G5SujMiGrKuoJJjVg&r=WsLJ5ywbW3XnTzqo_ETV62H6s1a5bcGgnrpl7xPRfic&m=00Y6K5t3WswGmNOO6WFFhxReMcZp10_pqq3Gh_aSm1c&s=84I3BnXlOpSL3H8dxEaHylU9iBYalkvo1MlMON5vUsQ&e=>  
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> <dd_loop.png><dd_avg.png>_______________________________________________
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