u133x3pMAPCOUNTS {u133x3p.db} | R Documentation |
u133x3pMAPCOUNTS provides the "map count" (i.e. the count of mapped keys) for each map in package u133x3p.db.
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.
mappedkeys
,
count.mappedkeys
,
checkMAPCOUNTS
u133x3pMAPCOUNTS mapnames <- names(u133x3pMAPCOUNTS) u133x3pMAPCOUNTS[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 u133x3p.db checkMAPCOUNTS("u133x3p.db")