How to change optimization variable
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How to take the number of zero elements of an optimization variable as part of the constraint condition？I want to take the number of non-zero solutions of the optimization variable x as part of the constraint.
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You cannot do that in a continuous optimization problem, although in sparse optimization, it is common to approximate the number of non-zeros as norm(x,1).
If it's a binary linear programming that you're solving, the number of non-zeros is simply the linear function sum(x). If it's a more general integer linear program where 0<=x(i)<=M, you can introduce extra binary variables z with the constraint that x/M<=z<=x, and the number of non-zeros will then be sum(z).
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