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...If I have a set of 10 points (X(i), Y(i)), is there an elegant way to build a function y=f(x) that would be build out of the consecutive segments of X(j),Y(j) points (with X(j) sorted)? Thank you very much TDB -- View this message in context: http://www.nabble.com/Function-built-with-segments-tp14337780p14337780.html Sent from the R help mailing list archive at Nabble.com.