User`s guide

1 Data Processing
When you apply idfilt to an idfrd data object, the data is rst converted
to a frequency-domain
iddata obje ct (see “Transforming Between
Frequency-Domain and Frequency-Response Data” on page 1-128). The result
is an
iddata object.
See Also
To learn how to lter data during linear mo del estimation in stea d, you can
set the
Focus property of the estimation algorithm to Filter and sp ecify the
lter characteristics. For more information about model properties, see the
Algorithm Pr oper ties reference page.
For more information about preltering data, see the chapter on preprocessing
data in System Identication: Theory for the User, Second Edition, by Lennart
Ljung, P rentice Hall PTR, 1999.
For p ractical examples of preltering data, see the section on posttreatment
of data in Modeling of Dynamic Systems, by Lennart Ljung and Torkel Glad,
Prentice Hall PTR, 1994.
1-114