mgu74aCHR               package:mgu74a               R Documentation

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

     mgu74aCHR is an R environment that provides mappings between a
     manufacturer id and the chromosome that contains the gene of
     interest.

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

     Each manufacturer id maps to a vector of chromosomes. Due to
     inconsistencies that may exist at the time the environment was
     built, the vector may contain more than one chromosome (e.g., the
     id 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:

     Entrez Gene:<URL:
     http://gopher5/compbio/annotationSourceData/ftp.ncbi.nlm.nih.gov/g
     ene/DATA/>. Built: Source data downloaded from Entrez Gene on Tue
     May 17 15:12:32 2005

     Package built: Tue May 17 15:19:01 2005

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

             # Convert to a list
             xx <- as.list(mgu74aCHR)
             # 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]]
             }

