Description Usage Arguments Details Value Author(s) Examples
Scaling and centering a matrix.
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object 
Numerical matrix (or an object coercible to such)
with samples in rows and variables as columns. Also takes

scale 
One of "UV" (unit variance a=a/σ_{a})
"vector" (vector normalisation b=b/b), "pareto" (sqrt
UV) or "none" to indicate which scaling should be used to scale
the matrix with a variables and b samples. Can also be
a vector of scales which should be used to scale the
matrix. 
center 
Either a logical which indicates if the matrix
should be mean centred or not, or a vector with averages which
should be suntracted from the matrix. 
eps 
Minimum variance, variable with lower variance are not scaled and warning is issued instead. 
simple 
Logical indicating if only the data should be returned or a list with the preprocessing statistics as well. 
reverse 
Logical indicating if matrix should be 'postprocessed' instead by multiplying each column with its scale and adding the center. In this case, center and scale should be vectors with the statistics (no warning is issued if not, instead output becomes the same as input). 
... 
Only used for passing through arguments. 
Does basically the same as scale
but adds some
alternative scaling options and functionality for treating
preprocessing as part of a model.
A preprocessed matrix or a list with
center 
a vector with the estimated centers 
scale 
a vector with the estimated scales 
data 
the pre (or post) processed data 
Henning Redestig
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