unscale is a generic function that unscale and/or uncenter the columns
of a matrix generated by the scale base function
A numeric matrix.
unscale uses attributes added by the scale function "scaled:scale" and
"scaled:center" and use these scaling factor to retrieve the initial matrix.
It first unscales and then uncenters.
Return a matrix, uncenterd and unscaled. Attributes "scaled:center" and "scaled:scale" are removed.
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