illuminaHumanv1MAPCOUNTS {illuminaHumanv1.db} | R Documentation

## Number of mapped keys for the maps in package illuminaHumanv1.db

### Description

illuminaHumanv1MAPCOUNTS provides the "map count" (i.e. the count of mapped keys) for each map in package illuminaHumanv1.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

      illuminaHumanv1MAPCOUNTS
      mapnames <- names(illuminaHumanv1MAPCOUNTS)
      illuminaHumanv1MAPCOUNTS[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 illuminaHumanv1.db
      checkMAPCOUNTS("illuminaHumanv1.db")

[Package illuminaHumanv1.db version 1.0.0 Index]