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Check whether a package is installed and suggest how to install from CRAN, Bioconductor, or other external source
checkPackageInstalled( pkgs, details = "to run this function", install.help = NULL, bioc = FALSE, cran = FALSE )
character Package name(s)
character Helper text (default = "to run this function")
character Additional information on how to install package (default = NULL)
logical Package(s) is/are available from Bioconductor (default = FALSE)
logical Package(s) is/are available from CRAN (default = FALSE)
if (FALSE) { checkPackageInstalled("sccore", cran = TRUE) }
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