Index exceeds matrix dimensions problem with this code below :-

Question

hannibal lecter 2018-1-7

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/375921-index-exceeds-matrix-dimensions-problem-with-this-code-below

回答： Walter Roberson 2018-1-7

 c =
     1     1     1     6
     2     4     2    16
    -1     5    -4    -3
 N = length(c);
 tol= 1e-6;
 for ii=1:N-1
    for jj=ii+1:N
       if abs(c(jj,ii))> tol 
          fac=c(ii,ii) / c(jj,ii);
          c(jj,:) = fac*c(jj,:) - c(ii,:);
       end
    end
 end

how to solve this problem? that code for Gauss elimination when I press enter it appear " Index exceeds matrix dimensions "

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Answer 1

ANKUR KUMAR 2018-1-7

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/375921-index-exceeds-matrix-dimensions-problem-with-this-code-below#answer_298999

在 MATLAB Online 中打开

c =[1 1 1 6; 2 4 2 16; -1  5  -4 -3]
    N = size(c,1)
    M=size(c,2)
 tol= 1e-6;
 for ii=1:M-1
     ii
    for jj=ii+1:N
        jj
       if abs(c(jj,ii))> tol 
          fac=c(ii,ii) / c(jj,ii);
          c(jj,:) = fac*c(jj,:) - c(ii,:);
       end
    end
 end

Instead of writing length(c), you should to define the size along first and second dimension of matrix, i.e. define the number of row and columns of matrix.