php - Summary of two columns(Weighted Mean)--jqGrid -


i need calculate weighted mean of 2 columns i.e.sum(col1*col2)/sum(col2) in jqgrid----i'm using jqsuite php trirand.

i able take 2 columns , find sum of product 

    psuedocol=>array(col1*col2+>"sum")

psuedocol stores product of 2 columns rowwise

i don't know how access sum in psuedocol generate weighted mean


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