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Nils B
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Infer Input Delay does not support multiple experiments - Bug ?

Asked by Nils B
on 30 Jul 2019
Latest activity Commented on by Rajiv Singh on 31 Jul 2019
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.

  1 Comment

Hi Nils,
Thnaks for reporting. I will take a look.

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