Generating numbers whose sum is 1 during genetic algorithms optimization

I need to run a GA optimization and I have 12 parameters whose values must be between 0 and 1. However, their sum must always be 1, as they represent fractions of a component.

How do I make sure that my genetic algorithm will generate numbers that satisfy these two conditons simultaneously?

Thank you!

Answer 1

[Matt J]

lb=zeros(12,1);
ub=lb+1;
Aeq=ub';
beq=1;