gahgu133bCHRLOC {gahgu133b.db} | R Documentation

## Map probeset IDs to Chromosomal Location

### Description

gahgu133bCHRLOC is an R object that maps probeset identifiers to the starting position of the gene. The position of a gene is measured as the number of base pairs.

The CHRLOCEND mapping is the same as the CHRLOC mapping except that it specifies the ending base of a gene instead of the start.

### Details

Each probeset identifier maps to a named vector of chromosomal locations, where the name indicates the chromosome. If the chromosomal location is unknown, the vector will contain an `NA`.

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.

Mappings were based on data provided by: Genecards ( http://www.genecards.org ) on 2009-mag06

### Examples

            x <- gahgu133bCHRLOC
            # Get the probe identifiers that are mapped to chromosome locations
            mapped_probes <- mappedkeys(x)
            # Convert to a list
            xx <- as.list(x[mapped_probes])
            if(length(xx) > 0) {
              # Get the CHRLOC for the first five probes
              xx[1:5]
              # Get the first one
              xx[[1]]
            }

[Package gahgu133b.db version 2.0.1 Index]