How to assign values to MV Targets of MPC object from cell array

Question

Bill Tubbs 2022-10-6

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https://ww2.mathworks.cn/matlabcentral/answers/1818445-how-to-assign-values-to-mv-targets-of-mpc-object-from-cell-array

评论： Bill Tubbs 2023-1-25

采纳的回答： Emmanouil Tzorakoleftherakis

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I'm having a tough time trying to assign 3 values to the parameters of an mpc object.

Here is my MPC object with it's current values for the MV targets:

extractfield(mpcobj.MV, "Target")

ans =

1×3 cell array

{[38.6500]} {'nominal'} {'nominal'}

According to this answer, I should be able to assign values to a struct like this:

[mpcobj.MV.Target] = {99, 10, 'nominal'};

But I get this error message:

Error using mpc/subsasgn (line 511)

Scalar structure required for this assignment.

I tried this:

setfield(mpcobj.MV, "Target", {99, 10, 'nominal'});

but get the same error. I notice in the documentation there is an example like this:

MPCobj.DisturbanceVariables(1).ScaleFactor = 10;
MPCobj.DisturbanceVariables(2).ScaleFactor = 5;
MPCobj.DisturbanceVariables(3).ScaleFactor = 20;

Is there no way to assign these in one go (without a for loop)?

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Answer 1

Emmanouil Tzorakoleftherakis 2023-1-25

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https://ww2.mathworks.cn/matlabcentral/answers/1818445-how-to-assign-values-to-mv-targets-of-mpc-object-from-cell-array#answer_1156160

编辑：Emmanouil Tzorakoleftherakis 2023-1-25

在 MATLAB Online 中打开

You could specify values individually

mpcobj.MV(1).Target=99;
mpcobj.MV(2).Target=10;

or you could do it in one line as follows:

mpcobj.MV = struct(Target={99;10;'nominal'});

Hope that helps

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Emmanouil Tzorakoleftherakis 2023-1-25

在 MATLAB Online 中打开

You don't really need a for loop for 3 values, but if you want to do it in one line, I guess the following should work:

mpcobj.MV = struct(Target={99;10;'nominal'});

I updated my answer as well

Bill Tubbs 2023-1-25

Thanks. This is the answer I was looking for. The reason I would have needed a for loop is because the cell array is of indefinite length.

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How to assign values to MV Targets of MPC object from cell array

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