Infer Input Delay does not support multiple experiments - Bug ?

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Nils B 2019-7-30

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https://ww2.mathworks.cn/matlabcentral/answers/474000-infer-input-delay-does-not-support-multiple-experiments-bug

关闭： MATLAB Answer Bot 2021-8-20

So I have multiple experiments organized in an IDDATA object for a heating process,

where G is a heat generator and T is a temperature sensor. I have organized the data like this:

G1 G2 G3 T1 T2 T3

0 1 0 x y z

My problem is when i try to estimate the model with a non linear ARX model and use the Infer Input Delay GUI it just does not work.

I cant choose from different experiments. I get the error:

Error using impulseest (line 84)

Objective function is undefined at initial point. fmincon cannot continue.

Error in nlutilspack.delayestim/draw (line 80)

m = impulseest(z,[],'negative');

Error in nlutilspack.delayestim/attachListeners>LocalInputChanged (line 51)

this.draw;

Error while evaluating UIControl Callback.

I think the reason for this is when i try to display, lets say u2 and y1, and u2 is 0 i get the error. But my experiment is organized in a way where in each experiment

only u1 OR u2 OR u3 are 1 and the others are zero. The problem is the GUI does not let me choose from another experiment. Does the arx model even evaluate all

the experiments? I think thats very strange behaviour.