I want to arrange the first column of a matrix in ascending order. But my Code is not showing the correct value.

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Abhishek Prakash 2015-8-29

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关闭： MATLAB Answer Bot 2021-8-20

 >> A = [15 4; 3 -1; 10 78; -9 101];
 >> t=A; % Temporary matrix
 >> B= zeros([4,2]); % Output Matrix
 >> for i=4:1
      MAX_NUM = max(A(1:i,1));
      [ROW_NUM, COL_NUM] = find(A==MAX_NUM); 
      B(i,1:2) = A(ROW_NUM,1:2);
      A(ROW_NUM,1:2) = A(i,1:2);
      i = i-1;
 end
 >> A=t;
 >> disp(B)
     0     0
     0     0
     0     0
     0     0

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Answer 1

Walter Roberson 2015-8-29

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4:1 is empty. If you want to count backwards you need 4:-1:1

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Abhishek Prakash 2015-8-29

编辑：Walter Roberson 2015-8-29

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 >> A = [15 4; 3 -1; 10 78; -9 101];
 >> t=A; % Temporary matrix
 >> B= zeros([4,2]); % Output Matrix
 >> for i=4:-1:1
      MAX_NUM = max(A(1:i,1));
      [ROW_NUM, COL_NUM] = find(A==MAX_NUM);
      B(i,1:2) = A(ROW_NUM,1:2);
      A(ROW_NUM,1:2) = A(i,1:2);
   end
 ??? Subscripted assignment dimension mismatch.