casc
====

cascade realization of filter from coefficients



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


::

    [cels]=casc(x,z)




Arguments
~~~~~~~~~

:x (4xN)-matrix where each column is a cascade element, the first two
  column entries being the numerator coefficients and the second two
  column entries being the denominator coefficients
: :z string representing the cascade variable
: :cels resulting cascade representation
:



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

Creates cascade realization of filter from a matrix of coefficients
(utility function).



Examples
~~~~~~~~


::

    x=[1,2,3;4,5,6;7,8,9;10,11,12]
    cels=casc(x,'z')