Array indices must be positive integers or logical values

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Fabian Haslwanter 2023-1-16

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https://ww2.mathworks.cn/matlabcentral/answers/1894745-array-indices-must-be-positive-integers-or-logical-values

评论： Walter Roberson 2023-1-16

采纳的回答： KSSV

在 MATLAB Online 中打开

So i have the following Constraints for a heat storage (ws) as part of my yalmip optimization problem:

Constraints=[]
for t = 1:24
    Constraints = [Constraints, dE(t) <= dEmax_WS, E_ws(t) <= Emax_ws, E_ws(t) == E_ws(t-1)+dE(t), E_ws(0) == 10];
end

When running, i get an indexing error:

"Error using sdpvar/subsref (line 161) -Array indices must be positive integers or logical values."

I assume the problem is the last equation, which should determine the current state of charge by adding the charge rate to the charge of the previous time step.

I know one way to change this is to start the loop at t=2 and define E_ws(1)=10. Is there another smoother way which lets me keep the equation in the same loop as the "regular" constraints?

Thank you!

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采纳的回答

KSSV 2023-1-16

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This line:

E_ws(0) == 10

gives you error. MATLAB indexing starts from 1. It cannot be zero. Think of it.

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Fabian Haslwanter 2023-1-16

在 MATLAB Online 中打开

I tried this as well, but I am still getting the same error:

clear all
%Constraints
Constraints=[];
for t = 1:24
    Constraints = [Constraints, dE(t) <= dEmax_ws, E_ws(t) <= Emax_ws, E_ws(t) == E_ws(t-1)+dE(t)];
end