illuminaHumanv2ProbeIDMAPCOUNTSpackage:illuminaHumanv2ProbeID.dbR Documentation

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

     illuminaHumanv2ProbeIDMAPCOUNTS provides the "map count" (i.e. the
     count of mapped keys) for each map in package
     illuminaHumanv2ProbeID.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:

       illuminaHumanv2ProbeIDMAPCOUNTS
       mapnames <- names(illuminaHumanv2ProbeIDMAPCOUNTS)
       illuminaHumanv2ProbeIDMAPCOUNTS[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 illuminaHumanv2ProbeID.db
       checkMAPCOUNTS("illuminaHumanv2ProbeID.db")

