Centering and scaling of matrices
Function to center and/or scale the coloumns of a matrix in various ways. The coloumns can be centered with their means or with supplied values, and they can be scaled with their standard deviations or with supplied values.
A logical, or a numeric vector. The values to subtract from each column. If
A lgical, or a numeric vector. The values to divide each column with. If
A logical. If
stdize standardizes the coloumns of a matrix by subtracting their means (or the supplied values) and dividing by their standard deviations (or the supplied values).
TRUE, division-by-zero is guarded against by substituting any 0 in
center (either calculated or supplied) with 1 prior to division.
The main difference between
scale is that
stdize divides by the standard deviations even when
center is not
Bjørn-Helge Mevik and Øyvind Langsrud
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