Undefined operator '+' for input arguments of type 'table'
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Hello to everybody,
I have a problem with a particular algorithm that performs a multi-objective optimization.
When I try to select a certain number of columns using two parameters in the algorithm this error appears: "Undefined operator '+' for input arguments of type 'table'", but when I try to do the same thing with 2 normal passages on the command window it works.
Could someone help me?
There are some pictures to understand what I mean![a.jpg](https://www.mathworks.com/matlabcentral/answers/uploaded_files/239879/a.jpeg)
![a.jpg](https://www.mathworks.com/matlabcentral/answers/uploaded_files/239879/a.jpeg)
![b.jpg](https://www.mathworks.com/matlabcentral/answers/uploaded_files/239880/b.jpeg)
2 Comments
Stephen23
on 26 Sep 2019
Edited: Stephen23
on 26 Sep 2019
The curse of global variables!
Global variables make it possible for data to be changed at any time by any function/class, which is why it is recommended to avoid using them. Most likely you could avoid this bug by writing better code without reyling on anti-pattern global variables.
etc.
Rather than global variables I strongly recommend either using nested functions or parameterizing your function/s., as appropriate for your algorithm.
Nothing in your code indicates why those variables defined in the base workspace should be the same as those global variables.
Answers (1)
Sebastian Körner
on 26 Sep 2019
try this:
i=V+M+1;
a= table2array(population(:,i))
if all(a(:)==0)
...
end
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