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...and 1's, and another vector v of equal length. I want to assign v[i]-1 to v[i] if r[i]=1, for all i. How would I do that using mapply or any other batch processing keywords? thanks. John -- View this message in context: http://r.789695.n4.nabble.com/element-wise-conditional-assignment-in-r-tp2951963p2951963.html Sent from the R help mailing list archive at Nabble.com.