hgu133aCHRLOC            package:hgu133a            R Documentation

_A_n_n_o_t_a_t_i_o_n _o_f _p_r_o_b_e _i_d_s _b_y _c_h_r_o_m_o_s_o_m_a_l _l_o_c_a_t_i_o_n

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

     hgu133aCHRLOC mappes probe ids to chromosomal locations (measured
     as number of base pairs from the p arm) for genes corresponding to
     the probe ids.

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

     This is an environment object with key and value pairs. Keys are
     probe ids and values are their corresponding chromosomal
     locations. NAs assigned to probe ids whose chromosomal locations
     are not known. Values are named vectors of length 1 or more
     depending on whether a given probe id can be mapped to a single or
     multiple locations on one or more than onw chromosomes. The names
     of the vectors give the chromosome number of concern. Names for
     chromosomal locations on the antisense strand have a leading "-"
     sign (e. g. -1234567). Chromosomal locations on both the sense and
     antisense strand 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. When a gene can not be placed on a chromosome with
     confidence, "random" is appended to the end of the name for a
     chromosomal location value.   

     Mappings were based on data provided by:

     Human Genome Project built: hg16.<URL:
     http://www.genome.ucsc.edu/goldenPath/hg16>

     Package built Wed Mar  3 16:27:29 2004

_R_e_f_e_r_e_n_c_e_s:

     <URL: http://www.genome.ucsc.edu/goldenPath/hg16/database/>

_E_x_a_m_p_l_e_s:

         # Covert to a list
         xx <- as.list(hgu133aCHRLOC)
         # 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]]
         }

