i have function file i want put limit in variables

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Pratik Anandpara
Pratik Anandpara 2017-3-17
评论： Steven Lord 2017-3-17
function y=myfitness(x)
y= x(1)+x(2)+x(3);
end
this is function file and i want 2<x1<11 ,3<x2<12, 4<x3<12 in this range and want y minimum answer in this range with help of genetic algorithm, i use 'ga' instruction also
fitfcn=@myfitness;
nvars=3;
[x fval]= ga(fitfcn,nvars);
i want minimize the function output value with this range with the help of Genetic algorithm

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回答（1 个）

Jan
Jan 2017-3-17
编辑：Jan 2017-3-17
You can limit the values using inputs for ga() - see doc ga:
x = ga(fitnessfcn,nvars,A,b) finds a local minimum x to fitnessfcn,
subject to the linear inequalities A*x ≤ b. ga evaluates the matrix
product A*x as if x is transposed (A*x').
Or better use the lower and upper bounds:
x = ga(fitnessfcn,nvars,A,b,Aeq,beq,LB,UB) defines a set of lower and
upper bounds on the design variables, x, so that a solution is found
in the range LB ≤ x ≤ UB.
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Pratik Anandpara
Pratik Anandpara 2017-3-17
2<x1<11 ,3<x2<12, 4<x3<12 for this three unknown variables..how to write instruction for this
Steven Lord
Steven Lord 2017-3-17
See the first Example on the documentation page to which Jan linked. It constrains the two variables to be greater than 0 using the variable lb. Just specify a three element vector for lb instead of a two element vector and specify a three element vector for ub as well. [The example didn't have an upper bound on the variable value, so it didn't need to specify ub and didn't specify it.]

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