Assign can be used to set a value to a variable that has name as a value of another variable. Example:
> name<-"essai" > assign(name, "plouf") > essai [1] "plouf" OK. But how to do the same when it is only an element of a vector, data frame and so on that must be changed. > vec<-1:10 > vec [1] 1 2 3 4 5 6 7 8 9 10 > vec[4] [1] 4 > name<-"vec[4]" > assign(name, 100) > vec [1] 1 2 3 4 5 6 7 8 9 10 The reason is probably here (from help of assign): assign does not dispatch assignment methods, so it cannot be used to set elements of vectors, names, attributes, etc. I have found this solution: > eval(parse(text=paste(name, "<-100", sep=""))) > vec [1] 1 2 3 100 5 6 7 8 9 10 Is-it the only way ? It is not very elegant ! Thanks a lot Marc __________________________________________________________ Marc Girondot, Pr Laboratoire Ecologie, Systématique et Evolution Equipe de Conservation des Populations et des Communautés CNRS, AgroParisTech et Université Paris-Sud 11 , UMR 8079 Bâtiment 362 91405 Orsay Cedex, France Tel: 33 1 (0)1.69.15.72.30 Fax: 33 1 (0)1.69.15.73.53 e-mail: marc.giron...@u-psud.fr Web: http://www.ese.u-psud.fr/epc/conservation/Marc.html Skype: girondot [[alternative HTML version deleted]]
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