exprSet2-class {limma} | R Documentation

## Expression Set - class

### Description

A class for storing intensity values from microarray experiments. This class is similar to `exprSet`.

This class is not currently used in the limma package. It is an experimental class to investigate the possibility of a unified data class structure for single-channel and log-ratio analyses of spotted microarray data.

### Slots

expressions
  `matrix` containing intensity data on log-2 scale. For two-color arrays, odd columns will usually correspond to channel 1 (green) and even columns to channel 2 (red) for different arrays.
weights
  `matrix` containing non-negative quality weights
targets
  `data.frame` containing factors corresponding to the columns of `expressions`
probes
  `data.frame` containing gene IDs or annotation information. Should have same number of rows as `expression`
printer
  `list` containing information about the printing process
notes
  `character`

### Methods

`exprSet2` objects inherit a `show` method from the virtual class `LargeDataObject`, which means that `exprSet2` objects will print in a compact way.

### Author(s)

Gordon Smyth

### See Also

02.Classes gives an overview of all the classes defined by this package.

`exprSet` is the corresponding class in the Biobase package.

[Package limma version 2.2.0 Index]