System Identification Toolbox

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In the command, the number of rows in the orders matrix must be equal to the number of model outputs.

Last post by fyousefi « Tue Mar 02, 2021 6:20 pm

by fyousefi » Tue Mar 02, 2021 6:20 pm

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Last post by fyousefi
Tue Mar 02, 2021 6:20 pm
Incorrect specification for model order in the command. For continuous-time polynomial models, specify ORDERS as a

Last post by fyousefi « Tue Mar 02, 2021 6:19 pm

by fyousefi » Tue Mar 02, 2021 6:19 pm

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Last post by fyousefi
Tue Mar 02, 2021 6:19 pm
The value of the "OutputWeight" option has been reset because its size does not match the number of model outputs.

Last post by fyousefi « Tue Mar 02, 2021 6:18 pm

by fyousefi » Tue Mar 02, 2021 6:18 pm

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Last post by fyousefi
Tue Mar 02, 2021 6:18 pm
The options "InputOffset" and "OutputOffset" cannot be used for frequency domain data.

Last post by fyousefi « Tue Mar 02, 2021 6:17 pm

by fyousefi » Tue Mar 02, 2021 6:17 pm

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Last post by fyousefi
Tue Mar 02, 2021 6:17 pm
Frequencies greater than the Nyquist frequency in data will be ignored.

Last post by fyousefi « Tue Mar 02, 2021 6:17 pm

by fyousefi » Tue Mar 02, 2021 6:17 pm

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Last post by fyousefi
Tue Mar 02, 2021 6:17 pm
Frequency domain data sets must all be continuous- or discrete-time.

Last post by fyousefi « Tue Mar 02, 2021 6:16 pm

by fyousefi » Tue Mar 02, 2021 6:16 pm

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Last post by fyousefi
Tue Mar 02, 2021 6:16 pm
The order of estimated model is larger than requested because the discrete-to-continuous conversion process added extra

Last post by fyousefi « Tue Mar 02, 2021 6:15 pm

by fyousefi » Tue Mar 02, 2021 6:15 pm

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447 Views

Last post by fyousefi
Tue Mar 02, 2021 6:15 pm
The sample time must be the same in all estimation data experiments.

Last post by fyousefi « Tue Mar 02, 2021 6:15 pm

by fyousefi » Tue Mar 02, 2021 6:15 pm

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Last post by fyousefi
Tue Mar 02, 2021 6:15 pm
The value of the "Feedthrough" option must be a logical vector of length equal to the number of system inputs.

Last post by fyousefi « Tue Mar 02, 2021 6:14 pm

by fyousefi » Tue Mar 02, 2021 6:14 pm

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Last post by fyousefi
Tue Mar 02, 2021 6:14 pm
The initial model used for estimation must be stable. Modify the model parameters manually or use the "init" command.

Last post by fyousefi « Tue Mar 02, 2021 6:13 pm

by fyousefi » Tue Mar 02, 2021 6:13 pm

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Last post by fyousefi
Tue Mar 02, 2021 6:13 pm
There is an indication of underdamped modes in the model. Consider including a "U" character in the "Type" value when ge

Last post by fyousefi « Tue Mar 02, 2021 6:10 pm

by fyousefi » Tue Mar 02, 2021 6:10 pm

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475 Views

Last post by fyousefi
Tue Mar 02, 2021 6:10 pm
For time-series models, the weighting filter and focus settings are not used. Model is estimated by prediction error min

Last post by fyousefi « Tue Mar 02, 2021 6:09 pm

by fyousefi » Tue Mar 02, 2021 6:09 pm

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456 Views

Last post by fyousefi
Tue Mar 02, 2021 6:09 pm
The frequency response could not be estimated at some frequencies. Try larger resolution size.

Last post by fyousefi « Tue Mar 02, 2021 6:08 pm

by fyousefi » Tue Mar 02, 2021 6:08 pm

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457 Views

Last post by fyousefi
Tue Mar 02, 2021 6:08 pm
The noise spectrum and uncertainties could not be estimated at some frequencies. Try larger resolution size.

Last post by fyousefi « Tue Mar 02, 2021 6:08 pm

by fyousefi » Tue Mar 02, 2021 6:08 pm

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445 Views

Last post by fyousefi
Tue Mar 02, 2021 6:08 pm
The data is interpreted as single output with { number,integer} inputs. If this is not correct, provide data using an I

Last post by fyousefi « Tue Mar 02, 2021 6:07 pm

by fyousefi » Tue Mar 02, 2021 6:07 pm

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508 Views

Last post by fyousefi
Tue Mar 02, 2021 6:07 pm
The same window size must be applied to all outputs. The first entry will by used.

Last post by fyousefi « Tue Mar 02, 2021 6:07 pm

by fyousefi » Tue Mar 02, 2021 6:07 pm

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Last post by fyousefi
Tue Mar 02, 2021 6:07 pm
The data set contains experiments with different sample times. Sample time from the first experiment will be used

Last post by fyousefi « Tue Mar 02, 2021 6:06 pm

by fyousefi » Tue Mar 02, 2021 6:06 pm

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466 Views

Last post by fyousefi
Tue Mar 02, 2021 6:06 pm
The input is not sufficiently exciting for the chosen model order. Run the "advice" command on estimation data for more

Last post by fyousefi « Tue Mar 02, 2021 6:05 pm

by fyousefi » Tue Mar 02, 2021 6:05 pm

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418 Views

Last post by fyousefi
Tue Mar 02, 2021 6:05 pm
Specification of "Ts" property value is ignored for estimation of IDPOLY models.

Last post by fyousefi « Tue Mar 02, 2021 6:04 pm

by fyousefi » Tue Mar 02, 2021 6:04 pm

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428 Views

Last post by fyousefi
Tue Mar 02, 2021 6:04 pm
The list of input arguments used with the "n4sid" command may be incorrect or may correspond to an obsolete syntax. Type

Last post by fyousefi « Tue Mar 02, 2021 6:04 pm

by fyousefi » Tue Mar 02, 2021 6:04 pm

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569 Views

Last post by fyousefi
Tue Mar 02, 2021 6:04 pm
Computation of K matrix failed. Check that model order is not too high.

Last post by fyousefi « Tue Mar 02, 2021 6:03 pm

by fyousefi » Tue Mar 02, 2021 6:03 pm

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436 Views

Last post by fyousefi
Tue Mar 02, 2021 6:03 pm
Estimation of K matrix failed. It has been set to zero in the estimated model.

Last post by fyousefi « Tue Mar 02, 2021 6:02 pm

by fyousefi » Tue Mar 02, 2021 6:02 pm

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468 Views

Last post by fyousefi
Tue Mar 02, 2021 6:02 pm
Covariance Matrix is ill-conditioned. Problems may occur when computing model uncertainties.

Last post by fyousefi « Tue Mar 02, 2021 6:02 pm

by fyousefi » Tue Mar 02, 2021 6:02 pm

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Last post by fyousefi
Tue Mar 02, 2021 6:02 pm
The ''max'' field of the "Td" property has been set to sec ( samples).

Last post by fyousefi « Tue Mar 02, 2021 6:00 pm

by fyousefi » Tue Mar 02, 2021 6:00 pm

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409 Views

Last post by fyousefi
Tue Mar 02, 2021 6:00 pm
The specified time delay value is large relative to the sample time of the estimation data. This could slow down the est

Last post by fyousefi « Tue Mar 02, 2021 5:59 pm

by fyousefi » Tue Mar 02, 2021 5:59 pm

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402 Views

Last post by fyousefi
Tue Mar 02, 2021 5:59 pm

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