Why Struct contents reference from a non-struct array object occurs?

Hi, When I'm executing the code, I always face the problem 'Struct contents reference from a non-struct array object. In my program every time it is showing this error in such cases

'varnames = old.allVarNames'

Can anyone please tell me why it occurs and what should be the solution in above case?

[Stephen23]

"Can anyone please tell me why it occurs and what should be the solution in above case?"

Then old is not a structure. If you expect it to be a structure, then you need to find out why it is not a structure.

[madhan ravi]

You still didn’t provide enough information needed

[Walter Roberson]

Is old created by using load() or importdata()?

Answer 1

[Stephan]

Hi,

since you give very little information use:

https://de.mathworks.com/matlabcentral/answers/?language=de%2Cen&sort=relevance&status=accepted&term=%27Struct+contents+reference+from+a+non-struct+array+object

to find a solution. Otherwise tell us a little bit more. See:

https://de.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer

Best regards

Stephan

Answer 2

[Image Analyst]

Set a breakfront there and then double click old in the workspace to bring it up in the variables window. Or type old on the command line. You will see its values, and that it is not a structure, but some other type of variable:

>> whos old
>> old

Answer 3

[Ouafae errachedy]

I always face the problem 'Struct contents reference from a non-struct array object. In my program every time it is showing this error.

Struct contents reference from a non-struct array object.

Error in updateApp (line 6)

str1 = num2str(rto1.InputPort(1).Data);

Can anyone please tell me why it occurs and what should be the solution

[Image Analyst]

The reason is that your rto1 variable is not a structure or static class so you can do "dot anything". Or if rto1 is a structure, then rto1.InputPort(1) is not a structure with a field called "Data".

The answer is the same as for the original poster.

Set a break point there and look in the workspace at the variable to see what it actually is. Or when stopped there, put this in the command window

>> whos rto1
>> rto1