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Another possibility to build a transfer function model is to use the
`rational` constructor, which implements a transfer function as a
quotient of polynomials:

```
% DESCRIPTION: RATIONAL rational representation of a transfer function.
%
% a(1)s^m + a(2)s^{m-1} + ... + a(m+1)
% H(s) = --------------------------------------
% b(1)s^n + b(2)s^{n-1} + ... + b(n+1)
%
```

For example if the numerator and denominator coefficients are given by:

- num = [1 3 5]
- den = [1 8 10]

then we need to write down the following

m = rational([1 3 5], [1 8 10])

And now, as with the previous models, we can evaluate the response in a given frequency region

resp(m, plist('f1', 0.1, 'f2', 10))

Partial fraction representation | Transforming models between representations |

©LTP Team