Compute MAD between colums of a matrix or data.frame

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Description

Compute MAD between colums of a matrix or data.frame. Can be used to create a similarity matrix for a microarray experiment.

Usage

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Arguments

x

matrix or data.frame

Details

This functions computes the so called similarity matrix (based on MAD) for a microarray experiment; cf. Buness et. al. (2004).

Value

matrix of MAD values between colums of x

Note

A first version of this function appeared in package SLmisc.

Author(s)

Matthias Kohl Matthias.Kohl@stamats.de

References

Andreas Buness, Wolfgang Huber, Klaus Steiner, Holger Sueltmann, and Annemarie Poustka. arrayMagic: two-colour cDNA microarray quality control and preprocessing. Bioinformatics Advance Access published on September 28, 2004. doi:10.1093/bioinformatics/bti052

See Also

plotMAD

Examples

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## only a dummy example
M <- madMatrix(matrix(rnorm(1000), ncol = 10))
madPlot(M)

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