illuminaMousev1p1ProbeIDMAPCOUNTSpackage:illuminaMousev1p1ProbeID.dbR Documentation

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

     illuminaMousev1p1ProbeIDMAPCOUNTS provides the "map count" (i.e.
     the count of mapped keys) for each map in package
     illuminaMousev1p1ProbeID.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:

       illuminaMousev1p1ProbeIDMAPCOUNTS
       mapnames <- names(illuminaMousev1p1ProbeIDMAPCOUNTS)
       illuminaMousev1p1ProbeIDMAPCOUNTS[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 illuminaMousev1p1ProbeID.db
       checkMAPCOUNTS("illuminaMousev1p1ProbeID.db")

