extra paramters to ga output function

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I want to write an output function to the ga algorithm that will use and also change variables in my workspace in each iteration (plots, changes to a connected device etc). I read about it in the documentation but I couldn't quite figure it out. I would like to avoid using global variables, so is there a syntax example on how to add these extra input and output parameters? For example (which I know is incorrect but explains my intentions):
function [state,options,optchanged,a,b] = gaIterationOutput(options,state,flag,a,b,c,d)
% Do stuff with state,options,optchanged
% Do stuff with a,b,c,d
end
Here a,b,c,d are extra input parameters, and a,b are also sent as output parameters to the workspace. I understand it somehow needs to be done using anonymous functions, but I didn't understand exactly how.
Also, is it necessary to explicitly write
optchanged = false;
as can be seen in examples? (That is indeed the case with my code)
Thanks.

采纳的回答

Johnathan Viernik
Johnathan Viernik 2016-8-31
Ok, I've managed to solve all my porblems. I still don't know how to use the suggested nested function, but instead I used handles to send extra parameters to the function, as in my above comment to Walter Roberson. In order to change variables in the base workspace I used the commands
evalin
assignin
So now I have full control over any variable through the ga's output function.
A nice thread I found, if anyone wants to review these commands: Use of evalin and assignin in ga output function

更多回答(1 个)

Walter Roberson
Walter Roberson 2016-8-30
Yes, it is necessary to optchanged = false;
It is not possible to have extra outputs.
In your situation I would suggest not having the extra variables as inputs or outputs. Instead I would suggest that you use nested functions with shared variables. See http://www.mathworks.com/help/matlab/matlab_prog/share-data-between-workspaces.html#f0-50984
  5 个评论
Kurt Stewart
Kurt Stewart 2019-8-21
Use this to have it pass through the state
state.extra_param=extra_param
Then you can save things in the output function
case {'iter','interrupt'}
disp('Iterating ...')
fname=[pwd,'\','analysis',date_var,'.mat'];
gen_num=state.Generation;
%gen_str=['gen',num2str(gen_num)]
gen_data(gen_num).state=state;
save(fname,'gen_data')
Hope this helps any in the future!
Kurt Stewart
Kurt Stewart 2019-8-29
I am not sure how you got your solution to work, but I am working on it

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