Check for missing argument or incorrect argument data type in call to function 'abs'.

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I'm building code for getting IAE and ITAE values from a controller project.
Using a function already tested by me in other programs it returns this error message:
Check for missing argument or incorrect argument data type in call to function 'abs'.
The part of the code that is giving a problem is below:
res = sim('RTS.slx');
erroa= abs(1-res.control);
erroat = abs(dt *(1-res.control));
IAE= trapz(res.tempo, erroa);
ITAE= trapz(res.tempo, erroat);

Answers (2)

Paul
Paul on 31 Oct 2021
I doubt that res.control is a numeric array. Depending what how the signal "control" is formed in the simulation RTS, you'll probably need to use addittional qualfiers to get to the actual data in res.control. For example, if control is a timeseries output from a To Workspace block, you'd need
erroa = abs(1 - res.control.Data)
  11 Comments
Image Analyst
Image Analyst on 1 Nov 2021
Try operating on one column of data at a time
columnNumber = 15; % whatever...
erroa = 1 - res.control.Data(:, columnNumber);

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Image Analyst
Image Analyst on 31 Oct 2021
Edited: Image Analyst on 31 Oct 2021
res does not have a field, property, or method called control. What does this show:
res = sim('RTS.slx') % Don't use a semicolon
fieldnames(res)
properties(res)
methods(res)
v = res.control
whos v
Dont' use semicolons. If any throw errors, just comment them out and tell us what the rest display in the command window.

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