how to count the number of function calls without modifying it by inserting a counter ?
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Hi, for example in ga(...), the count of objective function calls is provided, but not that of the constraint function. My unsatisfactory solution is, in the main program, to insert a global variable to count and another to reset the counter :
global constr_count
global reset_constr_count % = 1 to reset
...
reset_constr_count = 1;
[x, fval, exitflag, output] = ga(handle_obj, I, ...
[], [], [], [], lx, ux, @my_constraint_function, options_ga);
and to insert those lines in the constraint function :
function [g, h] = my_constraint_function(x)
...
% counter constr_count of calls to this function :
global constr_count reset_constr_count;
persistent count;
if isempty(count) || reset_constr_count == 1
count = 1;
reset_constr_count = 0;
else
count = count + 1;
end
constr_count = count;
With this solution, I have to modify all my pre existing constraint functions, which is a hard task. Is there an easier way to count (not only in that ga example) ? Thank you !
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Accepted Answer
Matt J
on 10 Oct 2018
Edited: Matt J
on 10 Oct 2018
If you just provide a wrapper for your constraint function to ga(), then you can handle the counter there instead of changing your legacy constraint code. Also, if you make the wrapper a Nested Function like below, then there will be no need for global, persistent, or reset variables, and the control logic simplifies to one line:
function do_Optimization
constr_count=0; %externally scoped variable
x=ga(@fitnessfun,nVars,...,@my_constraint_wrapper);
function [g, h] = my_constraint_wrapper(x) %NESTED
constr_count = constr_count +1 ;
[g,h]= my_constraint_function(x);
end
end
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