Turn a microarray data object into a numeric matrix by extracting the expression values.
an object of class
additional arguments, not used for these methods.
These methods extract the matrix of log-ratios, for
marrayNorm objects, or the matrix of expression values for other expression objects such as
MArrayLM objects, the matrix of fitted coefficients is extracted.
These methods involve loss of information, so the original data object is not recoverable.
A numeric matrix.
02.Classes gives an overview of data classes used in LIMMA.
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