How can i bound initial guess during optimization

2015 12 19
1 个回答
更新时间：2015 12 29
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0 个投票

i have initial Guess
A= [ 0 30 0 30 30 30 30 30];
i don't want compiler take other values than 0 or 30. It should change only sequence.

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Walter Roberson
Walter Roberson 2015-12-19
编辑：Walter Roberson 2015-12-19
Which optimization routine are you using?
When you say that it should change only the sequence, do you mean that you want only permutations of A ?
Matt J
Matt J 2015-12-19
Since there are only 2^8 possible values for A, an exhaustive combinatoric search might be easiest.
Triveni
Triveni 2015-12-19
yes.....actually i want to generate combination and optimize...but things should be by algorithm..not by manual combination
Walter Roberson
Walter Roberson 2015-12-19
If it is permutations of A, then only 28 of them are distinguishable.
Triveni
Triveni 2015-12-19
Actually i putting A= [ 0 30 0 30 30 30 30 30]; as initial guess....and solver generates A= [754.31 45.21, 31.23...] but i want to change only sequence. i want to bound it to 0 or 30.
Walter Roberson
Walter Roberson 2015-12-19
Do you need the solutions to be permutations of A, so that in theory you could just try all the permutations and take the best one? Or do you need the upper bound to be 30 and the lower bound to be 0 and you accept all values between those two?
Which optimization routine are you calling?
Triveni
Triveni 2015-12-20
编辑：Triveni 2015-12-20
Just try all the permutations and take the best one.. you got right. I want only 0 and 30. don't want values between 0 and 30. I'm calling Genetic Algorithm. Please suggest...which one should be best.

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回答（1 个）

Walter Roberson
Walter Roberson 2015-12-20

1 个投票

Which input to ga() does this represent? If this is your x vector that is not explicitly passed in or initialized for ga(), then you would not use ga() at all: you would just call your objective function with all of the permutations .
A = [ 0 30 0 30 30 30 30 30];
Aperm = unique(perms(A),'rows');
best_perm = Aperm(1,:);
best_val = YourObjectiveFunction(best_perm);
for K = 2 : size(Aperm,1)
this_perm = Aperm(K,:);
this_val = YourObjectiveFunction(this_perm);
if this_val < best_val
best_perm = this_perm;
best_val = this_val;
end
end

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Triveni
Triveni
2015-12-19

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Walter Roberson
Walter Roberson
2015-12-29

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