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當我嘗試在R 2.6.0上下載軟件包時。我得到以下信息:無法訪問存儲庫的索引http://cran.irsn.fr/bin/windows/contrib/2.6
Avis : unable to access index for repository http://cran.irsn.fr/bin/windows/contrib/2.6
Avis : unable to access index for repository http://www.stats.ox.ac.uk/pub/RWin/bin/windows/contrib/2.6
Erreur dans install.packages(NULL, .libPaths()[1], dependencies = NA, type = type) :
no packages were specified
有任何有關如何解決這個問題