mgug4121aMAPCOUNTS {mgug4121a.db}R Documentation

Number of mapped keys for the maps in package mgug4121a.db

Description

mgug4121aMAPCOUNTS provides the "map count" (i.e. the count of mapped keys) for each map in package mgug4121a.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 checkMAPCOUNTS function defined in AnnotationDbi to compare and validate different methods (like count.mappedkeys(x) or sum(!is.na(as.list(x)))) for getting the "map count" of a given map.

See Also

mappedkeys, count.mappedkeys, checkMAPCOUNTS

Examples

  mgug4121aMAPCOUNTS
  mapnames <- names(mgug4121aMAPCOUNTS)
  mgug4121aMAPCOUNTS[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 mgug4121a.db
  checkMAPCOUNTS("mgug4121a.db")

[Package mgug4121a.db version 2.2.0 Index]