readHeader {limma} | R Documentation

## Read Header Information from Image Analysis Raw Data File

### Description

Read the header information from a GenePix Results (GPR) file or from an SMD raw data file. These functions are used internally by `read.maimages` and is not usually called directly by users.

### Usage

    readGPRHeader(file)
    readSMDHeader(file)

### Arguments

`file` | character string giving file name or including path

### Details

Raw data files exported by image analysis programs include a number of header lines which contain information about the scanning process. This function extracts that information and locates the line where the intensity data begins. `readGPRHeader` is for GenePix output, `readSMDHeader` is for

### Value

A list with components corresponds to lines of header information. All components are character vectors. A key component is `NHeaderRecords` which gives the number of lines in the file before the intensity data begins.

### Author(s)

Gordon Smyth

### References

http://www.axon.com/gn_GenePix_File_Formats.html

http://genome-www.stanford.edu/Microarray

### See Also

`read.maimages`

An overview of LIMMA functions to read data is given in 3.ReadingData.

[Package limma version 1.9.6 Index]