chooseBioCmirror(graphics = getOption("menu.graphics"), ind = NULL, useHTTPS = getOption("useHTTPS", TRUE), local.only = FALSE)menu.chooseCRANmirror).options("BioC_mirror").
"BioC_mirror": it is used
before a call to setRepositories. The out-of-the-box
default for that option is NULL, which currently corresponds to
the mirror https://bioconductor.org.The Bioconductor (World-wide) mirror is a network of mirrors providing reliable world-wide access; other mirrors may provide faster access on a geographically local scale.
ind chooses a row in
R_HOME/doc/BioC_mirrors.csv,
by number.
setRepositories, chooseCRANmirror.