hgu2beta7CHR            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_e _n_u_m_b_e_r_s _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_s _r_e_s_i_d_e

_D_e_s_c_r_i_p_t_i_o_n:

     Each chromosome of a given organism is assigned a number or letter
     for labeling purpose. hgu2beta7CHR maps probe ids to the numbers
     or letters labeling chromosomes where the genes corresponding to
     the probe ids reside

_D_e_t_a_i_l_s:

     Since a given gene may be found in more than one chromosomes, each
     probe id is mapped to a character vector of length 1 or greater.
     Probe ids that can not be mapped to any chromosome at the time
     when the package was built are assinged NAs. 

     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

_E_x_a_m_p_l_e_s:

             # Convert to a list
             xx <- as.list(hgu2beta7CHR)
             # Remove probe ids that do not map to any CHRLOC
             xx <- xx[!is.na(xx)]
             if(length(xx) > 0){
                 # Get the chromosome number for the first five probes
                 xx[1:5]
                 # Get the first one
                 xx[[1]]
             }

