The **discrete transfer function** block defines the
transfer function between the input signal u and the output
signal y. The numerator has the order nb-1, the denominator
has the order na-1.

b(1)*z^(nb-1) + b(2)*z^(nb-2) + ... + b(nb) y(z) = -------------------------------------------- * u(z) a(1)*z^(na-1) + a(2)*z^(na-2) + ... + a(na)

State variables **x** are defined according to
**controller canonical** form. Initial values of the
states can be set as start values of **x**.

Example:

Blocks.Discrete.TransferFunction g(b = {2,4}, a = {1,3});

results in the following transfer function:

2*z + 4 y = --------- * u z + 3

**Release Notes:**

*November 15, 2000*by Hans Olsson:

Converted to when-semantics of Modelica 1.4 with special care to avoid unnecessary algebraic loops.*June 18, 2000*by Martin Otter:

Realized based on a corresponding model of Dieter Moormann and Hilding Elmqvist.

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