agCHR                 package:ag.db                 R Documentation

_M_a_p _M_a_n_u_f_a_c_t_u_r_e_r _I_D_s _t_o _C_h_r_o_m_o_s_o_m_e_s

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

     agCHR is an R object that provides mappings between a manufacturer
     identifier and the chromosome that contains the gene of interest.

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

     Each manufacturer identifier maps to a vector of chromosomes. Due
     to inconsistencies that may exist at the time the object was
     built, the vector may contain more than one chromosome (e.g., the
     identifier may map to more than one chromosome). If the
     chromosomal location is unknown, the vector will contain an 'NA'.

     Mappings were based on data provided by: Tair (
     ftp://ftp.arabidopsis.org/Genes/TAIR_sequenced_genes ) on
     2007-Oct04

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

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

