Use N4sid for system identification (for new data estimation)

5 次查看（过去 30 天）
Xiwang
Xiwang 2013-7-2
Hi,
I am using N4sid toolbox to do a system identification problem. I used the command: "m = n4sid(z, 5,'Form','free', opt);" to create the system based on measured "input" and "output" (contains in z=z = iddata(y', u', 0.2, 'Name', 'heating/cooling load', 'TimeUnit', 's');".
However,I still want to use this model to predict some unmeasured cases. To be more specific, I have a new input measurement U2, I want to used to model to predict the output from U2. How can I realize that? What is command for this estimation using the model from N4sid?
Thanks very much.

请先登录，再回答此问题。

采纳的回答

Rajiv Singh
Rajiv Singh 2013-7-3
编辑：Rajiv Singh 2013-7-3
Computing response of a model to a given input is called simulation. Use the idParametric/sim command for that as in:
Ud = iddata([], U2, .2);
Yd = sim(m, Ud);
Y2 = Yd.y; % the raw response data
See:
http://www.mathworks.com/help/ident/ref/sim.html
http://www.mathworks.com/help/ident/ref/findstatesidparametric.html
  1 个评论
Xiwang
Xiwang 2013-7-7
Thanks very much. Rajiv. Another questions. If I use "ident" tool, and use the "state space model" to train the model, how can I code it in my "mfile"? And how can I apply the model to simulate the new data.
Thanks again.
Xiwang Li

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Linear Model Identification 的更多信息

标签

产品

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by