Obtains the mean of each column of the matrix and subtracts it from the given matrix in a centering operation.

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`x` |
A |

The application of this function to a matrix mimics the use of a centering matrix
given by: *{C_n} = {I_n} - \frac{1}{n}{11^T}*

centered_matrix A `matrix`

with the same dimensions of X that has been centered.

James J Balamuta

`cIRT`

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