Array indices must be positive integers or logical values.

Question

Jay Wagh 2022-7-10

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1756675-array-indices-must-be-positive-integers-or-logical-values

回答： Dhritishman 2022-7-10

z=0; 
z1=0;
aa=zeros(3,3);
for i=1:k
    z=z+t(i);
    z1=z1+t(i-1);
    aa(1,1)= aa(1,1) + (Qbar(1,1)*((-(T*0.5)+z)-(-(T*0.5)+z1)));
    
end

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Answer 1

Karim 2022-7-10

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The following part of you code can produce an error: i starts at 1, hence you are trying to acces t(0) which is not possible. In matlab the indexing starts at 1, hence the first element in the array t will be t(1)

for i = 1:k
    ...
        z1 = z1+t(i-1);
    ...
end

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Answer 2

Dhritishman 2022-7-10

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z1=z1+t(i-1);

In your code, the value of i starts at 1, so t(i-1) will be trying to access t(0) which MATLAB doesn't allow as indexing should start from 1. Hence, it throws an error. The first element in the array t will be t(1), not t(0).