idnlarx/operspec

Construct operating point specification object for idnlarx model

Syntax

spec = operspec(nlsys)

Description

spec = operspec(nlsys) creates a default operating point specification object for the idnlarx model nlsys. This object is used with findop and specifies constraints on the model input and output signal values. Modify the default specifications using dot notation.

Input Arguments

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`nlsys` — Nonlinear ARX model
`idnlarx` object

Nonlinear ARX model, specified as an idnlarx object.

Output Arguments

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`spec` — Operating point specification
operating point specification object

Operating point specification, used to determine an operating point of the idnlarx model using findop, returned as an object containing the following:

Input — Structure with fields:

Field	Description	Default for Each Input
`Value`	Initial guesses or fixed levels for the values of the model inputs, specified as a vector with length equal to the number of input signals.	`0`
`Min`	Minimum value constraints on the model inputs, specified as a vector with length equal to the number of input signals.	`-Inf`
`Max`	Maximum value constraints on the model inputs, specified as a vector with length equal to the number of input signals.	`Inf`
`Known`	Known value indicator, specified as a logical vector with length equal to the number of input signals and with the following values: `true` — `findop` will set the corresponding input signal to `Value`. `false` — `findop` will estimate the corresponding input signal using `Value` as an initial guess.	`true`

Output — Structure with fields:

Field	Description	Default for Each Output
`Value`	Initial guesses for the values of the model outputs, specified as a vector with length equal to the number of output signals.	`0`
`Min`	Minimum value constraints on the model outputs, specified as a vector with length equal to the number of output signals.	`-Inf`
`Max`	Maximum value constraints on the model outputs, specified as a vector with length equal to the number of output signals.	`Inf`

Version History

Introduced in R2008a