readLocsFile: Read ".locs" file.
In beadarray: Quality assessment and low-level analysis for Illumina BeadArray data

Description Usage Arguments Details Value Author(s)

Reads the binary Illumina bead location files and returns a matrix of the coordinate pairs for every bead on the array.

1	readLocsFile(fileName)

fileName

A string containing the name of the “.locs” file to be read.

The locs file contains bead centre locations for every bead on the array, unlike the bead level text files, with contain just the beads that were decoded. Reading these can be useful if one wants to verify that the image registration was successful, or is interested in the locations of the undecoded beads.

The locs file itself is in a binary format, with each of the bead locations stored as a pair of doubles. The first 2 bytes contain header information, with the 3rd byte containing the number of probes on the array. The location information begins with the 4th byte.

Returns a two column matrix of bead coordinates, one row per bead.

Mike Smith

beadarray documentation built on Nov. 8, 2020, 4:51 p.m.