gahgu133aCHRLOC         package:gahgu133a.db         R Documentation

_M_a_p _p_r_o_b_e_s_e_t _I_D_s _t_o _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:

     gahgu133aCHRLOC is an R object that maps probeset identifiers to
     the starting position of the gene. The position of a gene is
     measured as the number of base pairs.

     The CHRLOCEND mapping is the same as the CHRLOC mapping except
     that it specifies the ending base of a gene instead of the start.

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

     Each probeset identifier maps to a named vector of chromosomal
     locations, where the name indicates the chromosome. If the
     chromosomal location is unknown, the vector will contain an 'NA'.

     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.

     Mappings were based on data provided by: Genecards (
     http://www.genecards.org ) on 2009-mag06

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

             x <- gahgu133aCHRLOC
             # Get the probe identifiers that are mapped to chromosome locations
             mapped_probes <- mappedkeys(x)
             # Convert to a list
             xx <- as.list(x[mapped_probes])
             if(length(xx) > 0) {
               # Get the CHRLOC for the first five probes
               xx[1:5]
               # Get the first one
               xx[[1]]
             }

