User`s guide

Extracting P ara meter Values from Nonlinear Black-Box Mod els
Hammerstein-Wi
ener Parameter values
You can extract t
he numerical parameter values of a Hammerstein-Wiener
model by accessi
ng the properties of the
idnlhw model object.
The Hammerstein
-Wiener model parameter you might want t o explore
include model o
rders and delays, nonlinearity estimator parameters, and
the properties
of the linear m odel.
You can view the
parameters of the nonlin ea rity estimators using the
InputNonlinea
rity
and OutputNon line arity properties. For example:
% Load sample data.
load iddata1
% Estimate a Hammerstein-Wiener model that includes a
% no input nonlinearity and a wavenet output nonlinearity.
m = nlhw(z1,[2 2 1],[],'wav') ;
% Assign variables to the input and output nonlinearities.
% No input nonlinearity is equivalent to a unitgain nonliene arity.
uNL = m.InputNonlinearity;
yNL = m.OutputNonlinearity;
get(NL)
% Display output nonlinearity parameters.
yNL.Parameters
For more informa
tion about the
unitgain and wavenet nonlinearities, see
the correspondi
ng reference pages.
To access any pro
perties of a Hamm erstein-W iene r model object, use the
get command. For
more information about Hammerstein-Wiener model
properties, see
the
idnlhw reference page.
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