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idnlarx/operspec

Construct operating point specification object foridnlarxmodel

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Syntax

spec = operspec(nlsys)

Description

spec= operspec(nlsys)creates a default operating point specification object for theidnlarxmodelnlsys. This object is used withfindopand 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 anidnlarxobject.

Output Arguments

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Operating point specification, used to determine an operating point of theidnlarxmodel usingfindop, 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—findopwill set the corresponding input signal toValue.

    • false—findopwill estimate the corresponding input signal usingValueas 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

See Also