wcenter
=======

center and weight



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


::

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




Arguments
~~~~~~~~~

: x: real or complex vector or matrix
:



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

This function computes `s`, the weigthed and centred version of the
numerical matrix `x`.

For a vector or a matrix `x`, `s=wcenter(x)` returns in the `(i,j)`
coefficient of the matrix `s` the value `(x(i,j)-xbar)/sigma`, where
`xbar` is the mean of the values of the coefficients of `x` and
`sigma` his standard deviation.

`s=wcenter(x,'r')` (or, equivalently, `s=wcenter(x,1)`) is the rowwise
centre reduction of the values of `x`. It returns in the entry
`s(i,j)` the value `(x(i,j)-xbarv(j))/sigmav(j)` with `xbarv(j)` the
mean of the values of the `j` column and `sigmav(j)` the standard
deviation of the `j` column of `x`.

`s=wcenter(x,'c')` (or, equivalently, `s=wcenter(x,2)`) is the
columnwise centre reduction of the values of `x`. It returns in the
entry `s(i,j)` the value `(x(i,j)-xbarh(i))/sigmah(i)` with `xbarh(i)`
the mean of the values of the `i` row and `sigmah(i)` the standard
deviation of the `i` row of `x`.



Examples
~~~~~~~~


::

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




See Also
~~~~~~~~


+ `center`_ center


.. _center: center.html