Ga does not find the optimal value
2 visualizaciones (últimos 30 días)
Mostrar comentarios más antiguos
Erik Beste
el 4 de Mayo de 2022
Comentada: Erik Beste
el 5 de Mayo de 2022
Hi Matlab comunity after I tried fmincon:
I now tried ga to solve my problem with integers
x=ga(@(x)fAraucoMarkt(x,AraucoEnergy),4,[],[],[],[],LB,RB,@(x)bedMarkt(x,AraucoEnergy),[2:4]);
I guess it works but I do not get the optimal solution:
x=ga(@(x)fAraucoMarkt(x,AraucoEnergy),4,[],[],[],[],LB,RB,@(x)bedMarkt(x,AraucoEnergy),[2:4]);
Optimization terminated: average change in the penalty fitness value less than options.FunctionTolerance
but constraints are not satisfied.
Is there anyway to get a better solution (I was thinking of random starting numbers and than a list of all found solutions) but as I can not define start point I do not know how to get this.
And while I am at it I had an nonlinear eauqlity constrain which was like this
ceq(1)=Restschuld-0;
I was thinking in changing it to a inequality constrain Restschuld is smaller than 1 and bigger than -1
but I dont know how to do this any idea?
Anyone an Idea
Greetings
Erik
2 comentarios
Walter Roberson
el 4 de Mayo de 2022
Restschuld is smaller than 1 and bigger than -1
Those would be bounds constraints, which you would store in LB and RB
Respuesta aceptada
Walter Roberson
el 4 de Mayo de 2022
You have 3 variables, each of which can only be the integers 2, 3, or 4. That is only 3^3 = 27 possibilities.
Just run all of those possibilities separately, in a loop, with those variables as constants for the duration of the run.
This would have the additional advantage that since you would no longer have integer constraints, you would be able to add your own nonlinear constraint function.
13 comentarios
Torsten
el 4 de Mayo de 2022
Editada: Torsten
el 4 de Mayo de 2022
xf = zeros(1,3);
LB = 0;
RB = 1;
%optval = Inf;
index = 0;
for i = 0:15
for j = 1:30
for k = 0:70
%Fremdkapitalanteil
x0 = (RBFK-LBFK).*rand(1,1) + LBFK;
xf(1) = i;
xf(2) = j;
xf(3) = k;
[x,fval]=fmincon(@(x)fAraucoMarkt(x,xf,AraucoEnergy),x0,[],[],[],[],LB,RB,@(x)bedMarkt(x,xf,AraucoEnergy));
%if fval < optval
% optval = fval;
% xopt = x;
% xopt1 = i;
% xopt2 = j;
% xopt3 = k;
%end
index = index + 1;
Return=fAraucoMarkt(x,xf,AraucoEnergy);
Results(index,1:4)=[x,xf];
Results(index,5)=Return;
Results(index,6)=fminSpeich(x,xf,AraucoEnergy);
Results(index,7)=fRestschuld(x,xf,AraucoEnergy);
end
end
end
Más respuestas (1)
Matt J
el 4 de Mayo de 2022
Editada: Matt J
el 4 de Mayo de 2022
I was thinking in changing it to a inequality constrain Restschuld is smaller than 1 and bigger than -1
"When intcon is nonempty, nonlcon must return empty for ceq. For more information on integer programming, see Mixed Integer ga Optimization."
Ver también
Categorías
Más información sobre Solver Outputs and Iterative Display en Help Center y File Exchange.
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!