how to sum of column without sum function in a unit metrix

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MD Anower Hossain 2019-9-21

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https://ww2.mathworks.cn/matlabcentral/answers/481460-how-to-sum-of-column-without-sum-function-in-a-unit-metrix

评论： Matt J 2019-9-21

采纳的回答： Matt J

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x1 = [1 2 3; 4 5 6; 7 8 9];
  all =(x1);
summa=0;
count = 0;
    for i=1:length(all)
       % fprintf("%d\n",i);
       summa = 0;
       for j = 1:length(all)
            summa = summa + all(j);
           % fprintf("%d ",j);
       end 
        fprintf("%d ",summa);
    end

I want to sum every column without sum function , i tried it but i can't can anyone help me please ?

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采纳的回答

Matt J 2019-9-21

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在 MATLAB Online 中打开

summa = summa + all(j,i);

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MD Anower Hossain 2019-9-21

can you please describe it why you use all(j,i); why j and i ? i used only j .

Matt J 2019-9-21

Without this, "i" is not used anywhere. Why did you include a loop over "i" if you are not going to use it?

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MATLAB Language Fundamentals Matrices and Arrays Creating and Concatenating Matrices

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