readGEOAnn {annotate} | R Documentation

## Function to extract data from the GEO web site

### Description

Data files that are available at GEO web site are identified by GEO accession numbers. Given the url for the CGI script at GEO and a GEO accession number, the functions extract data from the web site and returns a matrix containing the data.

### Usage

    readGEOAnn(GEOAccNum, url = "http://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?")
    readIDNAcc(GEOAccNum, url = "http://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?")
    getGPLNames(url ="http://www.ncbi.nlm.nih.gov/geo/query/browse.cgi?")
    getSAGEFileInfo(url =
                           "http://www.ncbi.nlm.nih.gov/geo/query/browse.cgi?view=platforms&prtype=SAGE&dtype=SAGE")
    getSAGEGPL(organism = "Homo sapiens", enzyme = c("NlaIII", "Sau3A"))
    readUrl(url)

### Arguments

`url` | `url` the url for the CGI script at GEO
`GEOAccNum` | `GEOAccNum` a character string for the GEO accession number of a desired file (e. g. GPL97)
`organism` | `organism` a character string for the name of the organism of interests
`enzyme` | `enzyme` a character string that can be eighter NlaII or Sau3A for the enzyme used to create SAGE tags

### Details

`url` is the CGI script that processes user's request. `readGEOAnn` invokes the CGI by passing a GEO accession number and then processes the data file obtained.

`readIDNAcc` calls `readGEOAnn` to read the data and the extracts the columns for probe ids and accession numbers. The `GEOAccNum` has to be the id for an Affymetrix chip.

`getGPLNames` parses the html file that lists GEO accession numbers and descriptions of the array represented by the corresponding GEO accession numbers.

### Value

Both `readGEOAnn` and `readIDNAcc` return a matrix.
`getGPLNames` returns a named vector of the names of commercial arrays. The names of the vector are the corresponding GEO accession number.

### Note

This function is part of the Bioconductor project at Dana-Farber Cancer Institute to provide Bioinformatics functionalities through R

### Author(s)

Jianhua Zhang

### References

www.ncbi.nlm.nih.gov/geo

### Examples

    # Get array names and GEO accession numbers
    #geoAccNums <- getGPLNames()
    # Read the annotation data file for HG-U133A which is GPL96 based on
    # examining geoAccNums
    #temp <- readGEOAnn(GEOAccNum = "GPL96")
    #temp2 <- readIDNAcc(GEOAccNum = "GPL96")

[Package annotate version 1.8.0 Index]