Package 'limma' - Bioconductor

22 as.matrix
as.matrix
Turn a Microarray Data Object into a Matrix
Description
Turn a microarray data object into a numeric matrix by extracting the expression values.
Usage
## S3 method for class MAList
as.matrix(x,...)
Arguments
x
an object of class RGList, MAList, EList, MArrayLM, marrayNorm, PLMset,
ExpressionSet, LumiBatch or vsn.
... additional arguments, not used for these methods.
Details
These methods extract the matrix of log-ratios, for MAList or marrayNorm objects, or the matrix
of expression values for other expression objects such as EList or ExressionSet. For MArrayLM
objects, the matrix of fitted coefficients is extracted.
These methods involve loss of information, so the original data object is not recoverable.
Value
A numeric matrix.
Author(s)
Gordon Smyth
See Also
as.matrix in the base package or exprs in the Biobase package.
02.Classes gives an overview of data classes used in LIMMA.