hgu133aHGID             package:hgu133a             R Documentation

_A_n_n_o_t_a_t_i_o_n _o_f _p_r_o_b_e _i_d_e_n_t_i_f_e_r_s _b_y _H_o_m_o_l_o_G_e_n_e_I_D_s

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

     hgu133aHGID mappes probe ids to the internal HomoloGeneIDs used by
     NCBI to represent sequences (genes)

_D_e_t_a_i_l_s:

     This is an environment object with key and value pairs. Keys are
     probe ids and values are NCBI's HomoloGeneIDs. Values are vectors
     of length 1 or greater depending on whether a given probe id can
     be mapped to only one or more internal HomoloGeneIDs. NA is
     assigned to probe ids that can not be mapped to an internal
     HomoloGeneID at this time.

     This environment allows users to like probe ids to HomoloGeneIDs
     so that the homologous genes of probe ids can be explored using
     another data package named homology.

     Mappings were obtained using data probided by:

     Homology built: HomoloGene built date not available.<URL:
     ftp://ftp.ncbi.nih.gov/pub/HomoloGene/hmlg.ftp>

     LocusLink built: March  3, 2004. <URL:
     ftp://ftp.ncbi.nih.gov/refseq/LocusLink/LL_tmpl.ga>

     Package built Wed Mar  3 16:27:29 2004

_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(hgu133aHGID)
         # Remove probe ids that do not map to any HDID
         xx <- xx[!is.na(xx)]
         if(length(xx) > 0){
             # The HGIDs for the first two element of XX
             xx[1:2]
             # Get the first one
             xx[[1]]
         }

