# [ncl-talk] dim_variance_n_Wrap

Md. Jalal Uddin dmjalal90 at gmail.com
Fri Jan 18 23:38:42 MST 2019

```Thanks for your kind explanation. Could I calculate and plot of per day
variance, also for greater than 0 rainfall?

On Thu, Jan 17, 2019 at 1:58 PM Dennis Shea <shea at ucar.edu> wrote:

> More:
> *dim_variance_n_Wrap*(prc_reorder,*0*)   ; variance over *all days*:  *DRY
> and WET* seasons
>
> Consider Pune, India.
>    (say; made up numbers) day 170:   mean over DRY and WET seasons 10mm;
> range 0-500mm
>
>
> On Thu, Jan 17, 2019 at 2:12 PM Dennis Shea <shea at ucar.edu> wrote:
>
>> Well, you live with the monsoon.
>>
>> Some days have zero precipitation and some monsoon days have VERY LARGE
>> daily amounts.
>> Hence large variance.
>>
>> On Wed, Jan 16, 2019 at 10:53 PM Md. Jalal Uddin <dmjalal90 at gmail.com>
>> wrote:
>>
>>> Hi all,
>>>
>>> I am getting a too large variation of rainfall. I used
>>> dim_variance_n_Wrap function to calculate variance. The first figure is for
>>> the mean rainfall and the second one is for variance at the same time.
>>>
>>> Could anyone help me to understand where I am wrong?
>>>
>>> Variable: prc_reorder
>>> Type: double
>>> Total Size: 491961600 bytes
>>>             61495200 values
>>> Number of Dimensions: 3
>>> Dimensions and sizes: [time | 2847] x [latitude | 120] x [longitude |
>>> 180]
>>> Coordinates:
>>>             time: [ 120..6939]
>>>             latitude: [0.125..29.875]
>>>             longitude: [65.125..109.875]
>>> Number Of Attributes: 4
>>>   missing_value : -nan
>>>   _FillValue : -nan
>>>   units : mm
>>>   long_name : precipitation
>>>
>>> Best regards,
>>> 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
>>> Skype: dmjalal90
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>>

--
*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