hguatlas13kMAPCOUNTS     package:hguatlas13k.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 _h_g_u_a_t_l_a_s_1_3_k._d_b

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

     hguatlas13kMAPCOUNTS provides the "map count" (i.e. the count of
     mapped keys) for each map in package hguatlas13k.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:

       hguatlas13kMAPCOUNTS
       mapnames <- names(hguatlas13kMAPCOUNTS)
       hguatlas13kMAPCOUNTS[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 hguatlas13k.db
       checkMAPCOUNTS("hguatlas13k.db")

