armac
=====

Scilab description of an armax process



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


::

    [ar]=armac(a,b,d,ny,nu,sig)




Arguments
~~~~~~~~~

:a=[Id,a1,..,a_r] is a matrix of size (ny,r*ny)
: :b=[b0,.....,b_s] is a matrix of size (ny,(s+1)*nu)
: :d=[Id,d1,..,d_p] is a matrix of size (ny,p*ny);
: :ny dimension of the output y
: :nu dimension of the output u
: :sig a matrix of size (ny,ny)
:



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

This function creates a description as a tlist of an ARMAX process

`ar` is defined by


::

    ar=`tlist`_(['ar','a','b','d','ny','nu','sig'],a,b,d,ny,nu,sig);


and thus the coefficients of `ar` can be retrieved by e.g. `ar('a')`.



Examples
~~~~~~~~


::

    a=[1,-2.851,2.717,-0.865].*.`eye`_(2,2)
    b=[0,1,1,1].*.[1;1];
    d=[1,0.7,0.2].*.`eye`_(2,2);
    sig=`eye`_(2,2);
    ar=armac(a,b,d,2,1,sig)
    // extract polynomial matrices from ar representation 
    [A,B,D]=`arma2p`_(ar);




See Also
~~~~~~~~


+ `arma`_ Scilab arma library
+ `armax`_ armax identification
+ `armax1`_ armax identification
+ `arsimul`_ armax simulation
+ `arma2p`_ extract polynomial matrices from ar representation
+ `tlist`_ Scilab object and typed list definition.


.. _arma: arma.html
.. _arsimul: arsimul.html
.. _armax1: armax1.html
.. _arma2p: arma2p.html
.. _tlist: tlist.html
.. _armax: armax.html