center
======

center



Calling Sequence
~~~~~~~~~~~~~~~~


::

    s=center(x)
    s=center(x,'r') or s=center(x,1)
    s=center(x,'c') or s=center(x,2)




Arguments
~~~~~~~~~

: x: real or complex vector or matrix
:



Description
~~~~~~~~~~~

This function computes `s`, the centred version of the numerical
matrix `x`. For a vector or a matrix `x`, `s=center(x)` returns in the
`(i,j)` coefficient of the matrix `s` the value `(x(i,j)-xbar)`, where
`xbar` is the mean of the values of the coefficients of `x`.
`s=center(x,'r')` (or, equivalently, `s=center(x,1)`) is the rowwise
center reduction of the values of `x`. It returns in the entry
`s(i,j)` the value `(x(i,j)-xbarv(j))(j)` with `xbarv(j)` the mean of
the values of the `j` column. `s=center(x,'c')` (or, equivalently,
`s=center(x,2)`) is the columnwise center reduction of the values of
`x`. It returns in the entry `s(i,j)` the value `(x(i,j)-xbarh(i)))`
with `xbarh(i)` the mean of the values of the `i` row.



Examples
~~~~~~~~


::

    x=[0.2113249  0.0002211 0.6653811;
       0.7560439  0.3303271 0.6283918]
    s=center(x)
    s=center(x,'r')
    s=center(x,'c')




See Also
~~~~~~~~


+ `wcenter`_ center and weight


.. _wcenter: wcenter.html