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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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Nonlinear ARX model, specified as an idnlarx object.

Output Arguments

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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:

    FieldDescriptionDefault for Each Input
    ValueInitial 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
    MinMinimum value constraints on the model inputs, specified as a vector with length equal to the number of input signals.-Inf
    MaxMaximum 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:

    • truefindop will set the corresponding input signal to Value.

    • falsefindop will estimate the corresponding input signal using Value as an initial guess.

    true

  • Output — Structure with fields:

    FieldDescriptionDefault for Each Output
    ValueInitial guesses for the values of the model outputs, specified as a vector with length equal to the number of output signals.0
    MinMinimum value constraints on the model outputs, specified as a vector with length equal to the number of output signals.-Inf
    MaxMaximum value constraints on the model outputs, specified as a vector with length equal to the number of output signals.Inf

Introduced in R2008a