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

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Lucas Antonelo
Lucas Antonelo 2021-10-31
编辑： Paul 2021-11-1
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);

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回答（2 个）

Paul
Paul 2021-10-31
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)
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Paul
Paul 2021-10-31
编辑：Paul 2021-11-1
Ran in:
Hmm. Should work just fine:
res.control = timeseries(rand(84,3000),0:83);
res.control
timeseries Common Properties: Name: 'unnamed' Time: [84x1 double] TimeInfo: tsdata.timemetadata Data: [84x3000 double] DataInfo: tsdata.datametadata
erroa = abs(1 - res.control.Data);
iae = trapz(res.control.Time,erroa);
size(iae)
ans = 1×2
1 3000
Of course, res is just a regular structure here, not a Simulink.SimulationOutput object, but that shouldn't matter.
Do you see this after the which() command?
which trapz -all
/MATLAB/toolbox/matlab/datafun/trapz.m /MATLAB/toolbox/parallel/gpu/@gpuArray/trapz.m % Shadowed gpuArray method /MATLAB/toolbox/parallel/parallel/@codistributed/trapz.m % Shadowed codistributed method
Image Analyst
Image Analyst 2021-11-1
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 2021-10-31
编辑：Image Analyst 2021-10-31
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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