Check for missing argument or incorrect argument data type in call to function 'abs'.
显示 更早的评论
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);
回答（2 个）
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)
11 个评论
Lucas Antonelo
2021-10-31
Paul
2021-10-31
Now there is the same issue with res.tempo. You need additional qualification to get to the data in res.tempo that you are trying to access.
Lucas Antonelo
2021-10-31
Paul
2021-10-31
More information needed. Type these two lines in the command window and copy the results here
res.control
res.tempo
Lucas Antonelo
2021-10-31
Image Analyst
2021-10-31
It seem you can't subtract a time series from 1. Try to convert it to a double somehow. Maybe you meant (1-res.control.Time) or something?
Lucas Antonelo
2021-10-31
res.tempo is a timeseries as is res.control.
res.tempo.Time; % acceses the time vector
res.tempo.Data; % accesses the data values
In both cases, the Data is an 84 x 3000 array, one row per time point. It's likely, but not guaranteed, that res.tempo.Time and res.control.Time are equal to each other. I think you could do
erroa = 1 - res.control.Data;
but then erroa will be a timeseries that you can't input directly to trapz.
Maybe you you want to do something like this?
erroa = abs(1 - res.control.Data); % 84 x 3000 array
ITAE = trapz(res.control.Time,erroa) ; % should be a 1 x 3000 array, integrating each colum wrt time
Lucas Antonelo
2021-10-31
Hmm. Should work just fine:
res.control = timeseries(rand(84,3000),0:83);
res.control
erroa = abs(1 - res.control.Data);
iae = trapz(res.control.Time,erroa);
size(iae)
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
Image Analyst
2021-11-1
Try operating on one column of data at a time
columnNumber = 15; % whatever...
erroa = 1 - res.control.Data(:, columnNumber);
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.
类别
在 帮助中心 和 File Exchange 中查找有关 Numerical Integration and Differentiation 的更多信息
2021-10-31
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
