How can I fix the error: Index exceeds the number of array elements (1)?

Question

Sojung Park ，2023-3-16

0
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Direct link to this question

https://ww2.mathworks.cn/matlabcentral/answers/1929950-how-can-i-fix-the-error-index-exceeds-the-number-of-array-elements-1

评论： Voss ，2023-3-16

I am trying to plot a gragh of the eqution below when there is a relation between N_k, t, t_j. The relation is that N_k is the integer of t/tt.(when I define t_j=tt*N_k)

I'm confused how I can get the each value when t is changing within the range and apply the effects on the other components. I tried use array and matrix with 'for', but I getting an error 'Index exceeds the number of array elements (1)'. How can I fix it? Also, is this a right solution to solve this equation? Any comment will be helpful, thank you.

code:

clear
B_n = -5.36;
omega_d = 400;
zeta = 29;
tt=0.01;
upTo_t=10;
total = zeros(upTo_t*100, 1);   
for i=1:upTo_t*100
        t=0.01*i;
        T=t/tt;
        N_k=floor(T);
        
        points = zeros(1, N_k);
        for j=1:N_k
            t_j= tt*j;
            points(i,j) = exp(-(zeta/2).*(t(i)-t_j(j))).*(-zeta*(sin(omega_d/2.*(t(i)-t_j(j))))+ omega_d.*cos(omega_d/2*(t(i)-t_j(j))));
        end
        total(i,1) = B_n/omega_d.*sum(points(i,j));
end
plot(t, total)

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Answer 1

Voss 2023-3-16

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1929950-how-can-i-fix-the-error-index-exceeds-the-number-of-array-elements-1#answer_1194465

clear
B_n = -5.36;
omega_d = 400;
zeta = 29;
tt=0.01;
upTo_t=10;
N = upTo_t*100;
total = zeros(N, 1);
t=0.01*(1:N);
for i=1:N
    t_j= tt*(1:i);
    points = exp(-(zeta/2).*(t(i)-t_j)) ...
        .*(-zeta*(sin(omega_d/2.*(t(i)-t_j)))+ omega_d.*cos(omega_d/2*(t(i)-t_j)));
    total(i,1) = B_n/omega_d.*sum(points);
end
plot(t, total)