how to replace my double for loop which is little efficient!
thanks for your help. I am sorry I do not full understand your code, so i can not correct using your code to my data. here is the attachment of my data, and what I want to compute is the equation in the word document of the attachment: the code form Berend can get the answer i want to get. http://r.789695.n4.nabble.com/file/n3164741/my_data.rar my_data.rar
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