\HeaderA{hgu2beta7CHRLOC}{Mappings between probe identifiers and the chromosomal locations
of the genes represented by the probe identifiers}{hgu2beta7CHRLOC}
\keyword{datasets}{hgu2beta7CHRLOC}
\begin{Description}\relax
hgu2beta7CHRLOC maps probe ids to the starting positions of the genes
represented by the probe ids on chromosomes. The position of a gene is
measured as the number of base pairs.
\end{Description}
\begin{Details}\relax
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. Chromosomal locations on the
antisense strand have a leading "-" sign (e. g. -1234567). NAs are
assigned to probe ids whose chromosomal locations are not known.

Since a given gene may have more than one chromosomal locations, each
probe id is mapped to a named vector of length 1 or greater. The names
of each vector give the chromosome number where the genes reside. When
a gene can be mapped to a given chromosome but the exact location of
the gene can not be determined with confidence, "random" is appended to
the end of the name for a chromosomal location value.     

Mappings were based on data provided by:

Golden Path:\url{http://hgdownload.cse.ucsc.edu/goldenPath/hg17/database/}. Built: hg17

Package built Wed Feb 16 23:32:20 2005
\end{Details}
\begin{Examples}
\begin{ExampleCode}
    # Covert to a list
    xx <- as.list(hgu2beta7CHRLOC)
    # 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]]
    }
\end{ExampleCode}
\end{Examples}

