r10kcodMAPCOUNTS         package:r10kcod.db         R Documentation

_N_u_m_b_e_r _o_f _m_a_p_p_e_d _k_e_y_s _f_o_r _t_h_e _m_a_p_s _i_n _p_a_c_k_a_g_e _r_1_0_k_c_o_d._d_b

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

     r10kcodMAPCOUNTS provides the "map count" (i.e. the count of
     mapped keys) for each map in package r10kcod.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:

       r10kcodMAPCOUNTS
       mapnames <- names(r10kcodMAPCOUNTS)
       r10kcodMAPCOUNTS[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 r10kcod.db
       checkMAPCOUNTS("r10kcod.db")

