How to solve INDEX OUT OF BOUNDS ERROR? Please help me. Stuck in this for the past 10 days.

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Virajan Verma 2018-11-12

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eltn=30;             
%%(b)Element Connectivity Table
    count = 0 ;
    conn = zeros([],3) ;
    for i=1:30
        for j=1:27
            count = count+1 ;
        conn(count,:) =[j,j+1,j+2] 
        end
    end
    %Here the Code for Assembling (OR) Global Mass Matrix
    %x(i,j)=Kte_matrix(i,j);                     %DOUBT +=
    for i=1:27
         for j=1:27
          MG_matrix(conn(eltn,i) - 1,conn(eltn,j) - 1)= Mte_matrix(i,j); (ERROR HERE)
         end
    end

How to convert conn matrix in this range??

Attempted to access conn(30,4); index out of bounds because size(conn)=[810,3].

Error in practisee2 (line 558) MG_matrix(conn(eltn,i) - 1,conn(eltn,j) - 1)= Mte_matrix(i,j);

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Walter Roberson 2018-11-12

That is quite different initialisation than what you had before.

Virajan Verma 2018-11-13

That conn matrix is showing index out of bounds error as it has only 3 columns and for i>3, it has no elements to show. That is why i changed the initialization.

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回答（1 个）

KSSV 2018-11-12

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/429307-how-to-solve-index-out-of-bounds-error-please-help-me-stuck-in-this-for-the-past-10-days#answer_346492

Check the function assemble in the link. This will help you.

https://in.mathworks.com/matlabcentral/fileexchange/32029-plate-bending

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Virajan Verma 2018-11-13

The value of conn(eltn,j) for j=1 should be 59. How can it be zero??

Stephen23 2018-11-13

编辑：Stephen23 2018-11-13

"The value of conn(eltn,j) for j=1 should be 59. How can it be zero??"

Who said that j is equal to one when that error occurs? I don't see anything in your code that means that j equals one when that error occurs. Try looking at the value of j after the error has occured, and you might just learn something about your code.

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