I downloaded some packages from bioconductor, do I need to re-download them whenever I launch R?
No, you need to loading/attaching them: http://https://stat.ethz.ch/R-manual/R-devel/library/base/html/library.html
Sorry I am downloading biocLite("hugene10stprobeset.db"), it taking long time and I'm still waiting to be finished, do you think if it is normal?
Those probeset packages can be rather large, give it time.
thank you...still downloading
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