Hi, Linear lists, as described e.g. by N.Wirth in "Algorithms and Data Structures", seem not to be implemented in S/R, and this with some good reason, I think. Nevertheless I want to implement an algorithm using such linear lists. Does anybody have experience in this? I could not find any reference in R resources, also the Blue Book is mute here. Thank you Christian -- Dr. Christian W. Hoffmann, Swiss Federal Research Institute WSL Mathematics + Statistical Computing Zuercherstrasse 111 CH-8903 Birmensdorf, Switzerland Tel +41-44-7392-277 (office) -111(exchange) Fax +41-44-7392-215 (fax) christian.hoffmann at wsl.ch http://www.wsl.ch/staff/christian.hoffmann International Conference 5.-7.6.2006 Ekaterinburg Russia "Climate changes and their impact on boreal and temperate forests" http://ecoinf.uran.ru/conference/