Index exceeds the number of array elements. Index must not exceed 0. Help with debugging.

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Efrat Hazan Elimelech 2022-12-19

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https://ww2.mathworks.cn/matlabcentral/answers/1881462-index-exceeds-the-number-of-array-elements-index-must-not-exceed-0-help-with-debugging

评论： Efrat Hazan Elimelech 2022-12-19

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I just can't figure out what's wrong with the loop that this error occurs:

Index exceeds the number of array elements. Index must not exceed 0.

n_even=2:2:10;
x=1:10;
for j=1:length(n_even)
    for k=1:length(x)
        y(k)=8+4.*cos(x(k));
        [h_simp(j,k),I1_simp(j,k)]=simpson13(@(x) 8+4.*cos(x(k)),0,y(k),n_even(j));
    end
end

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Walter Roberson 2022-12-19

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You can see from this experiment that the overall framework does not give the indexing error, so the problem must be in simpson13

simpson13 = @(f, p, q, r) deal(randi(9), randi(9));
n_even=2:2:10;
x=1:10;
for j=1:length(n_even)
    for k=1:length(x)
        y(k)=8+4.*cos(x(k));
        [h_simp(j,k),I1_simp(j,k)]=simpson13(@(x) 8+4.*cos(x(k)),0,y(k),n_even(j));
    end
end
h_simp
h_simp = 5×10
     5     1     1     4     5     8     2     2     4     6
     8     3     9     8     2     6     6     9     2     5
     3     7     9     9     3     6     7     3     9     7
     5     7     9     8     1     8     2     7     3     9
     6     6     5     7     4     6     7     9     5     1