hgu2beta7LOCUSID          package:hgu2beta7          R Documentation

_M_a_p_p_i_n_g_s _b_e_t_w_e_e_n _p_r_o_b_e _i_d_e_n_t_i_f_i_e_r_s _a_n_d _L_o_c_u_s_L_i_n_k _i_d_e_n_t_i_f_i_e_r_s

_D_e_s_c_r_i_p_t_i_o_n:

     LocusLink identifiers are unique ids used by NCBI <URL:
     http://www.ncbi.nlm.nih.gov/LocusLink/> to represent genetic loci
     and link to curated sequence and descriptive information.
     hgu2beta7LOCUSID maps probe identifiers to LocusLink identifiers
     for genes represented by the probe identifiers.

_D_e_t_a_i_l_s:

     Mappings of probe ids to LocusLink ids are achieved through the
     linkage between probe ids to manufacturer/user provided ids
     contained in hgu2beta7ACCNUM. LocusLink ids are first mapped to
     manufacturer/user provided ids using file(s) provided by Locuslink
     and in some cases UniGene and other available sources and then
     linked to probe ids based on the mappings between probe ids and
     manufacturer/user provided ids.  

     When a given probe id was mapped to different LocusLink ids by
     different sources, the one agreed by most sources was selected.
     When no agreement was achieved among sources, the one of the
     smallest numeric value was selected. 

     Mappings were based on data provided by:

     LocusLink:<URL:
     ftp://ftp.ncbi.nih.gov/refseq/LocusLink/LL_tmpl.gz>. Built:
     February 16, 2005

     Package built: Wed Feb 16 23:32:20 2005

_R_e_f_e_r_e_n_c_e_s:

     <URL: http://www.ncbi.nlm.nih.gov>

_E_x_a_m_p_l_e_s:

         # Convert the environment to a list
         xx <- as.list(hgu2beta7LOCUSID)
         # Remove probe ids that do not map to any LOCUSID
         xx <- xx[!is.na(xx)]
         if(length(xx) > 0){
             # The LOCUSIDs for the first two elements of XX
             xx[1:2]
             # Get the first one
             xx[[1]]
         }

