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 -- View this message in context: http://r.789695.n4.nabble.com/how-to-replace-my-double-for-loop-which-is-little-efficient-tp3164222p3164741.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
