Index in position 2 exceeds array bounds appeared in code, how to fix it?

Question

Andra Cahaya Khalief 2023-3-2

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1921690-index-in-position-2-exceeds-array-bounds-appeared-in-code-how-to-fix-it

评论： Cris LaPierre 2023-3-9

function [xs, cost, A3] = f_bigM(A,M,n)
nc = 1;
A3(:,:,nc) = A;
%rA = size(A,1);
cA = size(A,2);
% initial problem
j_M = find(A(end,:)==M);
for jj = j_M
    ii = find(A(:,jj)==1);
    k = -A(end,jj)/A(ii,jj);
    A(end,:) = A(end,:)+k*A(ii,:);
end
nc = nc+1;
A3(:,:,nc) = A;
% find basic variables
i_res = (1);
for ii=1:cA
    a = A(:,ii);
    if(norm(a)==sum(a))
        jj = a==1;
        i_res = i_res(ii,jj);
    end
end
soln_exists = 0;
if ( length(unique(i_res(:,2))) == length(i_res(:,2)) )
    xs = zeros(1,cA-1);
    xs(i_res(:,1)) = A(i_res(:,2),end);
    soln_exists = isempty(find(xs < 0, 1));
end
xs = []; cost = [];
if soln_exists
    [xs, cost, A3s] = f_simplex(A,n);
    ns = size(A3s,3);
    A3(:,:,end+1:end+ns) = A3s;
end

Error in line :

if ( length(unique(i_res(:,2))) == length(i_res(:,2)) )

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Answer 1

Cris LaPierre 2023-3-2

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1921690-index-in-position-2-exceeds-array-bounds-appeared-in-code-how-to-fix-it#answer_1183845

编辑：Cris LaPierre 2023-3-2

在 MATLAB Online 中打开

This error is a result of using an index that exceeds the size of your array dimension (in this case, the 2nd dimension, or columns). It would appear your variable i_res does not have a 2nd column to index.

a = (1:5)'
a = 5×1
     1
     2
     3
     4
     5
% There is no second column, so an error message is displayed.
a(:,2)
Index in position 2 exceeds array bounds. Index must not exceed 1.