How can I dynamically add optimization variables for me problem in a loop?

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Mike 2023-3-22

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https://ww2.mathworks.cn/matlabcentral/answers/1933205-how-can-i-dynamically-add-optimization-variables-for-me-problem-in-a-loop

评论： Stephen23 2023-3-22

Hey :)

I have defined an optimization problem as follows:

prob = optimproblem;

Now I wanna add optimization variables in a loop, such as

for i = 1:10

x = optimvar('Test', 'LowerBound', 0);

end

where within the first iteration, the name of the variable should be x_1, in the second iteration it should be x_2 and so on.

I tried something like this, but it didn`t work:

['x_' int2str(i)] = optimvar(ans, 'LowerBound',0);

My next approach was defining a struct for the variables like the following:

for i = 1:10

ans = mat2str(this_is_a_test(i,:));

ans = regexprep(ans, '\[(.*)\]', '$1');

ans = strrep(ans,' ','');

ans = strcat('Test_', ans);

var = ans;

variables(.var) = optimvar(ans, 'LowerBound',0);

end

After obtaining the struct with my optimization variables, I cannot "transfer" it into prob.Variables

I would be extremely glad if someone could help me with this :)

If you need more information, don't hesitate to ask.

Best regards,

Mike

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Mike 2023-3-22

It's a n*m double. It's content is only consisting of ones and twos.

Stephen23 2023-3-22

在 MATLAB Online 中打开

"It's a n*m double. It's content is only consisting of ones and twos."

this_is_a_test = randi(1:2,10,3)
this_is_a_test = 10×3
     2     1     1
     1     2     2
     2     1     1
     1     2     1
     2     2     2
     1     1     1
     2     1     2
     2     1     1
     1     2     1
     1     2     2
var_names = [];
for i = 1:10
    ans = mat2str(this_is_a_test(i,:));
    ans = regexprep(ans, '\[(.*)\]', '$1');
    ans = strrep(ans,' ','');
    ans = strcat('Test_', ans);
    var_names = [var_names; ans];
end
V0 = string(var_names)
V0 = 10×1 string array
    "Test_211"
    "Test_122"
    "Test_211"
    "Test_121"
    "Test_222"
    "Test_111"
    "Test_212"
    "Test_211"
    "Test_121"
    "Test_122"

Here is a simpler approach to generate those names:

V1 = "Test_"+join(string(this_is_a_test),"")
V1 = 10×1 string array
    "Test_211"
    "Test_122"
    "Test_211"
    "Test_121"
    "Test_222"
    "Test_111"
    "Test_212"
    "Test_211"
    "Test_121"
    "Test_122"

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