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

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Marco Rozzi
Marco Rozzi 2019-9-26
编辑： Stephen23 2019-9-26
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 meana.jpg
b.jpg
  2 个评论
Stephen23
Stephen23 2019-9-26
编辑：Stephen23 2019-9-26
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
Marco Rozzi 2019-9-26
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

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回答（1 个）

Sebastian Körner
Sebastian Körner 2019-9-26
try this:
i=V+M+1;
a= table2array(population(:,i))
if all(a(:)==0)
...
end

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