problem with assigning in loop

Question

Hamid 2014-12-13

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/166505-problem-with-assigning-in-loop

编辑： Matt J 2014-12-13

采纳的回答： Matt J

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Hi everybody, I want to assign every minrow to Ep but Ican't and only last row gets number and other rows gets zero.

What should I do?

this is my code; Thank you guys.

u=0;
for i=1:ne
      Le(i)=sqrt((Ex(i,1)-Ex(i,2))^2+(Ey(i,1)-Ey(i,2))^2+(Ez(i,1)-Ez(i,2))^2);
    if Le(i)~=0
      u=u+1;
  [ minval , minidx ] = min(available(available(:, 6) > Le(i)/20000, 6));
     minrow = available(minidx, :);
     Ep=zeros(u,6);
       Ep(u,:)=minrow;
      end
  end

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Answer 1

Matt J 2014-12-13

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https://ww2.mathworks.cn/matlabcentral/answers/166505-problem-with-assigning-in-loop#answer_162237

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Get rid of the line

Ep=zeros(u,6);

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Hamid 2014-12-13

it works, thank you.

Matt J 2014-12-13

编辑：Matt J 2014-12-13

在 MATLAB Online 中打开

The code is still less than ideal, though. Why not compute Le with vectorized methods in advance of the loop so you can figure out how to pre-allocate Ep properly?

      Le=sqrt((Ex(:,1)-Ex(:,2))^2+(Ey(:,1)-Ey(:,2))^2+(Ez(:,1)-Ez(:,2))^2);
       Lenz=nonzeros(Le(1:ne));
       Ni=length(Lenz);
      Ep=zeros(Ni,6);
      for i=1:Ni
        [ minval , minidx ] = min(available(available(:, 6) > Lenz(i)/20000, 6));
         minrow = available(minidx, :);
        Ep(i,:)=minrow;
      end