Re : difference between avg and dim_avg (BIG DIFFERENCE ????????)

From: louis Vonder <appopson_at_nyahnyahspammersnyahnyah>
Date: Tue Nov 02 2010 - 11:18:34 MDT

Hi Sanjiv,

I am not an expert of NCL.
But if you read documents about these two functions, you can see that one consider "missing value" while another ignore it.
If there are missing value in your dataset, the difference come from this.

Perhaps this is not the right answer of your problem?

Regards

Louis

--- En date de : Mar 2.11.10, Sanjiv Kumar <sanjivconscious@gmail.com> a écrit :

De: Sanjiv Kumar <sanjivconscious@gmail.com>
Objet: [ncl-talk] difference between avg and dim_avg (BIG DIFFERENCE ????????)
À: "ncl-talk USERS" <ncl-talk@ucar.edu>
Date: Mardi 2 novembre 2010, 16h54

Hello,   I am using follwing functions to calculate average monthly value for the mississipi river basin. I have a mask file for the mississippi river basin that i used to mask the data.   PrintVarSummary(pcp) Variable: pcp
Type: float
Total Size: 41880240 bytes
            10470060 values
Number of Dimensions: 3
Dimensions and sizes:   [month | 12] x [lat | 621] x [lon | 1405]
Coordinates:
            month: [0..11]

            lon: [-125.0208..-66.47912]
Number Of Attributes: 5
  units :       mm/month
  long_name :   monthly_prism_pcp
  _FillValue :  -9999
  time_op_ncl : Climatology: 25 years

(1)     58.87543
(2)     74.17915
(3)     79.49629
(4)     102.1536
(5)     105.3508
(6)     89.25518
(7)     77.08332
(8)     74.19021
(9)     71.37045

(11)    63.43136   Average: 77.14     Option2:   do i= 0, 11
     print(avg(pcp(month|i, lat|:, lon|:)))
end do   (0)     40.91084
(0)     43.56288
(0)     61.70639
(0)     72.314
(0)     98.81877
(0)     95.28362
(0)     84.07236
(0)     72.15498
(0)     67.86727
(0)     61.63789
(0)     59.42875

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Received on Tue Nov 2 11:18:44 2010

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