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...tep) { y[i]=sign(x[j]-x[i])*(j-i) break; } } } but I wonder if there is a more efficient way to write this. I understand explicit looping can often be avoided in R using vector notation. Thanks for your help -- View this message in context: http://www.nabble.com/newbie%3Alooking-for-an-efficient-way-to-compute-distance-vector-tp15045583p15045583.html Sent from the R help mailing list archive at Nabble.com.