Le jeudi 19 avril 2012 à 09:34 +0300, Ana-Maria Dobre a écrit : > I have got the following statement: > > *> overview.domains$sample.var <- aggregate(migr$amigo.migr, > by=list(siruta=amigo$siruta), var)[,-1]/overview.domains$n.i.* > *Error in migr$amigo.migr : $ operator is invalid for atomic vectors* > > > What should i do to solve this error? Well, the error says it all: migr is a not a list, so you cannot use $ on it. The object is probably not what you think it is.
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