\HeaderA{hgu133aCHR}{Map Manufacturer IDs to Chromosomes}{hgu133aCHR}
\keyword{datasets}{hgu133aCHR}
\begin{Description}\relax
hgu133aCHR is an R object that provides mappings between a
manufacturer identifier and the chromosome that contains the gene of interest.
\end{Description}
\begin{Details}\relax
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 \code{NA}.

Mappings were based on data provided by: Entrez Gene ( ftp://ftp.ncbi.nlm.nih.gov/gene/DATA ) on 2007-Aug23
\end{Details}
\begin{Examples}
\begin{ExampleCode}
        x <- hgu133aCHR
        # 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]]
        }
\end{ExampleCode}
\end{Examples}

