hgu2beta7CHRLOC          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 _t_h_e _c_h_r_o_m_o_s_o_m_a_l _l_o_c_a_t_i_o_n_s
_o_f _t_h_e _g_e_n_e_s _r_e_p_r_e_s_e_n_t_e_d _b_y _t_h_e _p_r_o_b_e _i_d_e_n_t_i_f_i_e_r_s

_D_e_s_c_r_i_p_t_i_o_n:

     hgu2beta7CHRLOC maps probe ids to the starting positions of the
     genes represented by the probe ids on chromosomes. The position of
     a gene is measured as the number of base pairs.

_D_e_t_a_i_l_s:

     Chromosomal locations on both the sense and antisense strands are
     measured as the number of base pairs from the p (5' end of the
     sense strand) to q (3' end of the sense strand) arms. Chromosomal
     locations on the antisense strand have a leading "-" sign (e. g.
     -1234567). NAs are assigned to probe ids whose chromosomal
     locations are not known.

     Since a given gene may have more than one chromosomal locations,
     each probe id is mapped to a named vector of length 1 or greater.
     The names of each vector give the chromosome number where the
     genes reside. When a gene can be mapped to a given chromosome but
     the exact location of the gene can not be determined with
     confidence, "random" is appended to the end of the name for a
     chromosomal location value.     

     Mappings were based on data provided by:

     Golden Path:<URL:
     http://hgdownload.cse.ucsc.edu/goldenPath/hg17/database/>. Built:
     hg17

     Package built Wed Feb 16 23:32:20 2005

_E_x_a_m_p_l_e_s:

         # Covert to a list
         xx <- as.list(hgu2beta7CHRLOC)
         # Remove probe ids that do not map to any CHRLOC
         xx <- xx[!is.na(xx)]
         if(length(xx) > 0){
             # Gets the location for the first five probes
             xx[1:5]
             # Gets the first one
             xx[[1]]
         }

