illuminaHumanv2MAPCOUNTS package:illuminaHumanv2.db R Documentation

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_D_e_s_c_r_i_p_t_i_o_n:

     illuminaHumanv2MAPCOUNTS provides the "map count" (i.e. the count
     of mapped keys) for each map in package illuminaHumanv2.db.

_D_e_t_a_i_l_s:

     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.

_S_e_e _A_l_s_o:

     'mappedkeys', 'count.mappedkeys', 'checkMAPCOUNTS'

_E_x_a_m_p_l_e_s:

       illuminaHumanv2MAPCOUNTS
       mapnames <- names(illuminaHumanv2MAPCOUNTS)
       illuminaHumanv2MAPCOUNTS[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 illuminaHumanv2.db
       checkMAPCOUNTS("illuminaHumanv2.db")

