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...of this snippet - My actual dataset is large and it involves calculating the weighted mean of many columns. Such a loop becomes ugly to write and quite slow.... Thanks in advance, Vassilis -- View this message in context: http://r.789695.n4.nabble.com/weighed-mean-of-a-data-frame-row-by-row-tp3177421p3177421.html Sent from the R help mailing list archive at Nabble.com.