Help linearizing simulink model. "The value of the "A" property must be a numeric array without any Inf's or NaN's"

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Jamie 2013-10-25

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https://ww2.mathworks.cn/matlabcentral/answers/103349-help-linearizing-simulink-model-the-value-of-the-a-property-must-be-a-numeric-array-without-any

编辑： Jamie 2013-12-2

Capture.JPG

I have constructed a linear simulink model from a nonlinear model. The linear representation is included as an ss block. A controller and actuator dynamics have been introduced to examine the effects of slew rate limits. A pic of the model is attached.

When linearizing the model to obtain the closed-loop (broken-loop/dist/etc) response using the linear analysis design tool I am recieving the error

"The value of the "A" property must be a numeric array without any Inf's or NaN's"

While the condition number of the state matrix is relatively large (1.0377e+004) the state matrix is not singular. Naturally the elements of the state equation contain numeric values.

Searching the forums this does not appear to be a common error.

Any assitance in interpreting this error message would be most welcome.

Best,

Jamie

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Answer 1

Jamie 2013-10-28

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https://ww2.mathworks.cn/matlabcentral/answers/103349-help-linearizing-simulink-model-the-value-of-the-a-property-must-be-a-numeric-array-without-any#answer_113529

编辑：Jamie 2013-12-2

The error refers to the state matrix that is returned from the lin operation and simply indicates that the state matrix computed is singular to working precision.