\name{hgug4112aMAPCOUNTS} \alias{hgug4112aMAPCOUNTS} \title{Number of mapped keys for the maps in package hgug4112a.db} \description{ hgug4112aMAPCOUNTS provides the "map count" (i.e. the count of mapped keys) for each map in package hgug4112a.db. } \details{ This "map count" information is precalculated and stored in the package annotation DB. This allows some quality control and is used by the \code{\link[AnnotationDbi:AnnDbPkg-checker]{checkMAPCOUNTS}} function defined in AnnotationDbi to compare and validate different methods (like \code{count.mappedkeys(x)} or \code{sum(!is.na(as.list(x)))}) for getting the "map count" of a given map. } \seealso{ \code{\link[AnnotationDbi:Bimap-keys]{mappedkeys}}, \code{\link[AnnotationDbi:Bimap-keys]{count.mappedkeys}}, \code{\link[AnnotationDbi:AnnDbPkg-checker]{checkMAPCOUNTS}} } \examples{ hgug4112aMAPCOUNTS mapnames <- names(hgug4112aMAPCOUNTS) hgug4112aMAPCOUNTS[mapnames[1]] x <- get(mapnames[1]) sum(!is.na(as.list(x))) count.mappedkeys(x) # much faster! ## Check the "map count" of all the maps in package hgug4112a.db checkMAPCOUNTS("hgug4112a.db") } \keyword{datasets}