optimization problem with arrays

2022 12 7
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更新时间：2022 12 7
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Hello, I am trying to create a problem based optimization problem for minimazing.
To summer it up, I want to do this optimization and I don't know how to do what I have in bold:
array1 = array2 - array3 .* (optimization_variable);
A=sum(array1(array1>0));
objective = A;
Is there any way to put conditionals in an optimization problem?
Thanks in advance

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Bruno Luong
Bruno Luong 2022-12-7
编辑：Bruno Luong 2022-12-7

1 个投票

Could you try this equivalent expression
A=sum(array1.*(array1>0));

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Gerard Burjalès
Gerard Burjalès 2022-12-7
Thanks for your comment but it is not working.
I think that the problem is due to the fact that it is an optimizationExpresion so the comparison doesn't work.
I am adding the error, the same I had before, that I get:
Error using ()
Subscripting into a table using one subscript (as in t(i)) is not supported. Specify a row subscript and a variable subscript, as in t(rows,vars). To select variables, use t(:,i) or for one variable t.(i). To select rows, use t(i,:).
Error in optim.internal.problemdef.display.writeExtraParams
Error in optim.problemdef.OptimizationExpression/expandNonlinearStr
Error in optim.internal.problemdef.display.showDisplay
Error in optim.problemdef.OptimizationProblem/expandObjectives2str
Error in optim.internal.problemdef.ProblemImpl/expand2str
Error in optim.internal.problemdef.ProblemImpl/showproblem
Error in optim.internal.problemdef.ProblemImpl/show
Bruno Luong
Bruno Luong 2022-12-7
编辑：Bruno Luong 2022-12-7
May be you should relax the if test and replace it with one of the sigmodid function
https://en.wikipedia.org/wiki/Sigmoid_function
S = @(x) atan(x)/(pi/2); % select the function you want
scale = ... ; small number appropriate for array1.
A = sum(array1.*((S(array1/scale)+1)/2));
Gerard Burjalès
Gerard Burjalès 2022-12-7
Thanks for solving the issue and for the warm welcome in this community

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