Datatype error nlgreyest parameters

M Lut

2023 1 30

0 个回答

12 次查看（30 天）

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I would appreciate any help on resolving the error

Error using iddata/nlgreyest
In 'Ident:estimation:infeasibleSimulation', data type supplied is incorrect for parameter {0}.
Error in identifyModel (line 64)
model = nlgreyest(dataObject, model, opt);

I assume parameter {0} means it concerns the first parameter, although matlab typically doesn't use zero indexing. I use the following code to create my parameter struct for idnlgrey, and all values are standard doubles.

function identificationParam = defineParamModel()
a11 = -1;
a22 = -1;
a33 = -1e-1;
a23 = 0;
a32 = 0;
identificationParam(1).Name       = 'dynamic matrix';
identificationParam(1).Unit       = '';
identificationParam(1).Value      = [a11, 0, 0;
    0, a22, a23;
    0, a32, a33];
identificationParam(1).Minimum    = [-inf, 0,0;
    0, -inf, -inf;
    0, -inf, -inf];
identificationParam(1).Maximum    = [0, 0,0;
    0, 0, inf;
    0, inf, 0];
identificationParam(1).Fixed      = [0, 1, 1;
    1, 0, 0;
    1, 0, 0];
end

Thank you,

mlut

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M Lut 2023-4-19

Hi Bernardo,

what I did is to enable "pause on errors", and then checked what the error was actually about. In my case it had nothing to do with the parameters. In my case I didn't expect to the 'fileArgument' of the ode function to be encapsulated in a cell array.

Biggest recommendation after trying to work with it for some time now: Don't use the toolbox, write your own code. There are a ton of bugs, the interface is horrible and the error reports not helpful.

Best regards,

Max

Brendan McGovern 2023-9-27

I cant figure out the fix it keeps bring me to line 59 and im getting the same error. I read through the documentation and the file arguement is expected to be in a cell array, but what did you do to actually fix it?

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