[BioC] Bioconductor on Unix: cannot load the library affy

[Jeff Gentry]

> > library(affy)
> Error in library(package, character.only = TRUE, logical = TRUE, warn.conflicts = warn.conflicts,  : 
>         This is not a valid package -- no DESCRIPTION exists
> Error in library(affy) : .First.lib failed
> > q()

It would seem that somehow your installation of the affy package is
broken.