Error in line for CVX

Question

Aniz Mohamed Rafeeck 2021-9-26

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1461224-error-in-line-for-cvx

评论： the cyclist 2021-9-27

T = 3;
K = 3;
q = 1;
p = [10,1,8];
v = {};
v(1,:) = {[0.08 0.01 1.13;
    0 0.02 1.1;
    0 0 1.03]};
v(2,:) = {[0.06 0.03 1.07;
    0 0.04 1.16;
    0 0 1.04]};
v(3,:) = {[0.03 0.01 1.08;
    0 0.08 1.01;
    0 0.0 1.1]};
cvx_begin
v_max = [0.08 0.01 1.13;
    0 0.04 1.16;
    0 0 1.1];
variable m(3);
expression P(3);
for i = 1:T
    P(i) = (1+1/100)^(m(i)-i)*(1+sum(v_max(m(i),:)));
end
minimize(sum(P))
subject to 
for i = 1:T
    m(i)<=T;
    m(i)>=i;
end
cvx_end

I get an error as

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Answer 1

the cyclist 2021-9-26

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https://ww2.mathworks.cn/matlabcentral/answers/1461224-error-in-line-for-cvx#answer_795709

在 MATLAB Online 中打开

I don't know CVX, but the error message seems straightforward. My best guess is that m is a variable of type cvx, and you are trying to use it as an index in this expression:

v_max(m(i),:)

It seems that this syntax is not allowed. Perhaps there is some kind of type conversion you can use.

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Aniz Mohamed Rafeeck 2021-9-27

How do you rectify it

the cyclist 2021-9-27

I don't know. You are asking a CVX question, not a MATLAB question. Maybe you can find a forum for CVX.

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Answer 2

Sulaymon Eshkabilov 2021-9-26

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1461224-error-in-line-for-cvx#answer_795714

在 MATLAB Online 中打开

Here is the corrected part of the code:

...
%cvx_begin            % Invalid MATLAB command
v_max = [0.08 0.01 1.13;
    0 0.04 1.16;
    0 0 1.1];
% variable m(3);     % Invalid MATLAB command
% expression P(3);   % Invalid MATLAB command
m= [1, 2, 3];
for i = 1:T
    P(i) = (1+1/100)^(m(i)-i)*(1+sum(v_max(m(i),:)));
end
min(sum(P))
for i = 1:T
    m(i)<=T;
    m(i)>=i;
end
%  cvx_end         % Invalid MATLAB command    