System Identification Toolbox

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If models of higher order are of interest, it is recommended to use more steps, or to let the step occur later, or to pr

Last post by fyousefi « Tue Mar 02, 2021 8:39 am

by fyousefi » Tue Mar 02, 2021 8:39 am

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Last post by fyousefi
Tue Mar 02, 2021 8:39 am
Input number ,number,integer} is persistently exciting of order ,number,integer}. This means that you will have prob

Last post by fyousefi « Tue Mar 02, 2021 8:38 am

by fyousefi » Tue Mar 02, 2021 8:38 am

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Last post by fyousefi
Tue Mar 02, 2021 8:38 am
Excitation level cannot be determined for time series data.

Last post by fyousefi « Tue Mar 02, 2021 8:36 am

by fyousefi » Tue Mar 02, 2021 8:36 am

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Last post by fyousefi
Tue Mar 02, 2021 8:36 am
Information on excitation level could not be obtained from data. Use the "pexcit" command to test the data for degree of

Last post by fyousefi « Tue Mar 02, 2021 8:35 am

by fyousefi » Tue Mar 02, 2021 8:35 am

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Last post by fyousefi
Tue Mar 02, 2021 8:35 am
There is an indication that the system has a direct response from input number(s) at time t to the output(s) at the

Last post by fyousefi « Tue Mar 02, 2021 8:35 am

by fyousefi » Tue Mar 02, 2021 8:35 am

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625 Views

Last post by fyousefi
Tue Mar 02, 2021 8:35 am
1. There is direct feedback from y(t) to u(t) (like a P-regulator). In that case it is essential not to let this feedbac

Last post by fyousefi « Tue Mar 02, 2021 8:34 am

by fyousefi » Tue Mar 02, 2021 8:34 am

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Last post by fyousefi
Tue Mar 02, 2021 8:34 am
2. The system has a direct term (relative degree zero). Then it is essential to use nk = 0 for these inputs in all model

Last post by fyousefi « Tue Mar 02, 2021 8:33 am

by fyousefi » Tue Mar 02, 2021 8:33 am

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Last post by fyousefi
Tue Mar 02, 2021 8:33 am
There is no significant indication of feedback in the data (unless you decide that the direct term is due to feedback).

Last post by fyousefi « Tue Mar 02, 2021 8:32 am

by fyousefi » Tue Mar 02, 2021 8:32 am

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Last post by fyousefi
Tue Mar 02, 2021 8:32 am
Use the "feedback" command for assessment of feedback with more options.

Last post by fyousefi « Tue Mar 02, 2021 8:31 am

by fyousefi » Tue Mar 02, 2021 8:31 am

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Last post by fyousefi
Tue Mar 02, 2021 8:31 am
There is a very strong indication of feedback in data.

Last post by fyousefi « Tue Mar 02, 2021 8:30 am

by fyousefi » Tue Mar 02, 2021 8:30 am

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643 Views

Last post by fyousefi
Tue Mar 02, 2021 8:30 am
There is a possible indication of feedback in

Last post by fyousefi « Tue Mar 02, 2021 8:29 am

by fyousefi » Tue Mar 02, 2021 8:29 am

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532 Views

Last post by fyousefi
Tue Mar 02, 2021 8:29 am
You should be careful when interpreting the results of SPA and also interpret the results of output error models with ca

Last post by fyousefi « Tue Mar 02, 2021 8:28 am

by fyousefi » Tue Mar 02, 2021 8:28 am

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589 Views

Last post by fyousefi
Tue Mar 02, 2021 8:28 am
Possibility of feedback could not be determined. Use the "feedback" command for assessment of feedback in data with more

Last post by fyousefi « Tue Mar 02, 2021 8:27 am

by fyousefi » Tue Mar 02, 2021 8:27 am

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570 Views

Last post by fyousefi
Tue Mar 02, 2021 8:27 am
Possibility of feedback cannot be determined for time series data.

Last post by fyousefi « Tue Mar 02, 2021 8:27 am

by fyousefi » Tue Mar 02, 2021 8:27 am

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577 Views

Last post by fyousefi
Tue Mar 02, 2021 8:27 am
Possibility of feedback cannot be determined because data contains no output signals.

Last post by fyousefi « Tue Mar 02, 2021 8:26 am

by fyousefi » Tue Mar 02, 2021 8:26 am

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560 Views

Last post by fyousefi
Tue Mar 02, 2021 8:26 am
Data in experiment numbers are irregularly sampled. Possibility of nonlinearity cannot be determined for such data.

Last post by fyousefi « Tue Mar 02, 2021 8:25 am

by fyousefi » Tue Mar 02, 2021 8:25 am

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551 Views

Last post by fyousefi
Tue Mar 02, 2021 8:25 am
Building nonlinear models with this data may be difficult. In particular, Hammerstein models (IDNLHW with only input non

Last post by fyousefi « Tue Mar 02, 2021 8:24 am

by fyousefi » Tue Mar 02, 2021 8:24 am

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537 Views

Last post by fyousefi
Tue Mar 02, 2021 8:24 am
A nonlinear ARX model of order {0} and treepartition nonlinearity estimator performs better prediction of output than th

Last post by fyousefi « Tue Mar 02, 2021 7:25 am

by fyousefi » Tue Mar 02, 2021 7:25 am

0 Replies

629 Views

Last post by fyousefi
Tue Mar 02, 2021 7:25 am
There is no clear indication of nonlinearities in this data set. Use the "isnlarx" command to perform the assessment of

Last post by fyousefi « Tue Mar 02, 2021 7:24 am

by fyousefi » Tue Mar 02, 2021 7:24 am

0 Replies

555 Views

Last post by fyousefi
Tue Mar 02, 2021 7:24 am
Possibility of nonlinearity cannot be determined for data containing no output signals.

Last post by fyousefi « Tue Mar 02, 2021 7:05 am

by fyousefi » Tue Mar 02, 2021 7:05 am

0 Replies

527 Views

Last post by fyousefi
Tue Mar 02, 2021 7:05 am
Possibility of nonlinearity cannot be determined for complex data. Note that estimation of nonlinear models requires rea

Last post by fyousefi « Tue Mar 02, 2021 7:04 am

by fyousefi » Tue Mar 02, 2021 7:04 am

0 Replies

510 Views

Last post by fyousefi
Tue Mar 02, 2021 7:04 am
No assessment of nonlinearity is available for frequency domain data. Note that estimation of nonlinear models requires

Last post by fyousefi « Tue Mar 02, 2021 7:03 am

by fyousefi » Tue Mar 02, 2021 7:03 am

0 Replies

509 Views

Last post by fyousefi
Tue Mar 02, 2021 7:03 am
No assessment of nonlinearity is available for frequency domain data. Note that estimation of nonlinear models requires

Last post by fyousefi « Tue Mar 02, 2021 7:03 am

by fyousefi » Tue Mar 02, 2021 7:03 am

0 Replies

480 Views

Last post by fyousefi
Tue Mar 02, 2021 7:03 am
The model is not estimated, so nothing can be said about its accuracy. Its ability to reproduce data can be assessed by

Last post by fyousefi « Tue Mar 02, 2021 7:02 am

by fyousefi » Tue Mar 02, 2021 7:02 am

0 Replies

540 Views

Last post by fyousefi
Tue Mar 02, 2021 7:02 am
The validation dataset specified for "advice" may be same as the model estimation data. If so, consider using a differen

Last post by fyousefi « Tue Mar 02, 2021 7:01 am

by fyousefi » Tue Mar 02, 2021 7:01 am

0 Replies

478 Views

Last post by fyousefi
Tue Mar 02, 2021 7:01 am

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