Find property of InputNonLineraity with idPiecewiseLinear with 0 Number of Units on idnlhw

Question

Clément 2023-10-12

回答： Tianyu 2023-10-18

Hi,

I Have estimate an Hammerstein-Wiener models with idnlhw. I have use for the non linearity input an idPiecewiseLinear like this :

InputNonlinearity=idPiecewiseLinear;

InputNonlinearity.NumberOfUnits = 0;

OutputNonlinearity=idPiecewiseLinear;

OutputNonlinearity.NumberOfUnits = 40;

sys1 = nlhw(data1, [1 1 3], InputNonlinearity, OutputNonlinearity);

I need to know the slope of my non-linear inlet :

But in the workspace with 0 Number of units I can't know my slope :

If someone know to extract some data to know my input you can help me a lot.

Thanks.

Answer 1

Tianyu 2023-10-18

The slope is not a public property. You can access this using the internal command:

>> p = getInternalParameters(sys1.InputNonlinearity);

>> slope = p.LinearCoef;

Please be aware that this internal command is not documented and may change its usage in the future.