Sort first column of a 5x2 matrix but keep the rows intact after sorting

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1582251394 2019-3-15

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评论： 1582251394 2019-3-15

Hi, I have a 5x2 matrix and I would like to sort the first column and keep the rows together after the sorting is done. For example, I have an array given by

UP = zeros(5,2)
ai  = [13,11,15,26,20]
for i = 1:5
    UP(i,1) = ai;
    UP(i,2) = i;
end

After I sort the first column of the array, I would like to keep the second column assigned with the value of the first column. I would like an output that looks like the following

11,2
13,1
15,3
20,5
26,4

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Answer 1

Stephen23 2019-3-15

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https://ww2.mathworks.cn/matlabcentral/answers/450344-sort-first-column-of-a-5x2-matrix-but-keep-the-rows-intact-after-sorting#answer_365628

编辑：Stephen23 2019-3-15

在 MATLAB Online 中打开

Use sortrows:

>> V = [13,11,15,26,20];
>> M = [V;1:numel(V)].'
M =
   13    1
   11    2
   15    3
   26    4
   20    5
>> Z = sortrows(M,1)
Z =
   11    2
   13    1
   15    3
   20    5
   26    4