rat2302MAPCOUNTS {rat2302.db}R Documentation

Number of mapped keys for the maps in package rat2302.db

Description

rat2302MAPCOUNTS provides the "map count" (i.e. the count of mapped keys) for each map in package rat2302.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

  rat2302MAPCOUNTS
  mapnames <- names(rat2302MAPCOUNTS)
  rat2302MAPCOUNTS[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 rat2302.db
  checkMAPCOUNTS("rat2302.db")

[Package rat2302.db version 2.2.0 Index]