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...x>0) y else -y Now I have vectors x and y of equal length and I'd like to apply f element-wise. I.e. conceptually z <- f(x,y) where x, y, z are vectors of the same length Some magic involving apply? Thanks -- View this message in context: http://www.nabble.com/vectorizing-a-function-tp24380064p24380064.html Sent from the R help mailing list archive at Nabble.com.