Undefined operator '+' for input arguments of type 'table'

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

[Stephen23]

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.

https://blogs.mathworks.com/videos/2010/03/08/top-10-matlab-code-practices-that-make-me-cry/

https://www.mathworks.com/matlabcentral/answers/351423-problem-with-global-variables

https://www.mathworks.com/matlabcentral/answers/356111-global-variables-in-functions

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.

[Marco Rozzi]

I thought that was an elegant way use this kind of variable.

I have changed my script defining the variables for each function and it seems to work.

Thank you, I was going crazy

Answer 1

[Sebastian Körner]

try this:

i=V+M+1;
a= table2array(population(:,i))
if all(a(:)==0)
    ...
end