如何在 MATLAB 中根据一列对二维数组进行排序？

How can I sort a 2-D array in MATLAB with respect to one column?

提问by Midhat

I would like to sort a matrix according to a particular column. There is a sortfunction, but it sorts all columns independently.

我想根据特定列对矩阵进行排序。有一个sort函数，但它独立地对所有列进行排序。

For example, if my matrix datais:

例如，如果我的矩阵data是：

 1     3
 5     7
-1     4

Then the desired output (sorting by the first column) would be:

然后所需的输出（按第一列排序）将是：

-1     4
 1     3
 5     7

But the output of sort(data)is:

但输出sort(data)是：

-1     3
 1     4
 5     7

How can I sort this matrix by the first column?

如何按第一列对这个矩阵进行排序？

回答by Kena

I think the sortrowsfunction is what you're looking for.

我认为sortrows功能正是您要寻找的。

>> sortrows(data,1)

ans =

    -1     4
     1     3
     5     7

回答by AlessioX

An alternative to sortrows(), which can be applied to broader scenarios.

的替代方案sortrows()，可应用于更广泛的场景。

1. save the sorting indices of the row/column you want to order by:

   [~,idx]=sort(data(:,1));
   

2. reorder all the rows/columns according to the previous sorted indices

   data=data(idx,:)
   

1. 保存要排序的行/列的排序索引：

   [~,idx]=sort(data(:,1));
   

2. 根据之前的排序索引对所有行/列重新排序

   data=data(idx,:)