# How to solve an optimization problem with the objective function is a matrix ?

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Majid on 21 Sep 2022
Commented: Majid on 23 Sep 2022
Hello everyone!
I have no idea how to solve optimization problems.
I have an objective function which is a binary matrix, should this matrix be defined (known) or not?
knowing that I looked for examples but I didn't find the relevant one with my problem.
I would be grateful if you could help me!
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Majid on 21 Sep 2022

Walter Roberson on 21 Sep 2022
Each element of the matrix is effectively a separate objective, so in order to do this you would need to use a multi-objective optimizer.
You can use Problem Based Optimization https://www.mathworks.com/help/optim/problem-based-approach.html . You would probably create optimization variables that are marked as integers with lower bound 0 and upper bound 1. You would set up whatever constraints are appropriate. You would set up a matrix objective . solve() should then notice that gamultiobj() is needed to minimize the problem.
Note that there is a difference between a problem in which the best location is a binary matrix, compared to a problem in which the objective is a binary matrix. If the inputs are all binary and a matrix, but the output were scalar (for example an economic dispatch cost) then there are a number of different minimizers, but there are only a quite small number that can deal with there being multiple objectives (each element of the output matrix being a different objective.)
Majid on 23 Sep 2022
@Torsten nothing was change, i didn't understand where is the problem?