[gradsusr] Calulate mean of data with undefined values

[Manas Prem. Gautam]

Hi, 
I am trying to calculate the mean of the same variable from four different datasets of the same spatial(grid) and temporal resolution. 
I want to do this in such a way so that the dividing count value at every grid point equal to the number of the dataset which has do 
not have undefined values at that grid point. 

Any help will be highly appreciated. 

-- 
Manas Prem Gautam 
K. Banerjee Center of Atmospheric and Ocean Studies 
University Of Allahabad, Allahabad, 
Uttar Pradesh, India - 211004 
Email: mpgautam at allduniv.ac.in 
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