\HeaderA{hgu2beta7CHR}{Mappings between probe identifiers and the chromosome numbers the
genes represented by the probe ids reside}{hgu2beta7CHR}
\keyword{datasets}{hgu2beta7CHR}
\begin{Description}\relax
Each chromosome of a given organism is assigned a number or letter
for labeling purpose. hgu2beta7CHR maps probe ids to the numbers or
letters labeling chromosomes where the genes corresponding to the
probe ids reside
\end{Description}
\begin{Details}\relax
Since a given gene may be found in more than one chromosomes, each
probe id is mapped to a character vector of length 1 or greater. Probe
ids that can not be mapped to any chromosome at the time when the
package was built are assinged NAs. 

Mappings were based on data provided by:

LocusLink:\url{ftp://ftp.ncbi.nih.gov/refseq/LocusLink/LL_tmpl.gz}. Built: February 16, 2005

Package built: Wed Feb 16 23:32:20 2005
\end{Details}
\begin{Examples}
\begin{ExampleCode}
        # Convert to a list
        xx <- as.list(hgu2beta7CHR)
        # 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]]
        }
\end{ExampleCode}
\end{Examples}

