Hi Josh, Thank you for your feedback, after lot of trial and error the problem is finally solved.
To solve this problem, I tried in this order: 1) uninstalling the two packages "Matrix" and "lme4" and reinstalling them. 2) uninstalling doBy and reinstalling it with and without 1) 3) upgrading to the latest R version and re-doing 1) 2) And finally 4) wiped all R traces from my Mac OS X 10.7.2 and re-installed the latest version. The latest Matrix version seems to have changed in the meanwhile so I was lucky and now it works. It seems to me that the whole concept of dependency analysis for installing packages in R is broken ... seems like the packages depend only on the package name and not on the specific versions which is wrong as in this case, chances are that a user will say in this "live lock" where will never find a "happy together" versions of Matrix and lme4 ... but well, you statisticians know better about chances :P Thank you again. Best regards, Giovanni On Oct 23, 2011, at 3:12 AM, Joshua Wiley wrote: > Hi Giovanni, > > This is a dependency issue between lme4 and Matrix. There is > substantial discussion of this on the R sig mixed models list. A > simple update may fix the problem, or you may need to be a little bit > more precise about getting version of Matrix and lme4 that work with > each other. > > HTH, > > Josh ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.