matlab sortrows 返回原序号
时间: 2023-11-02 16:54:14 浏览: 158
在Matlab中,可以使用sortrows函数对矩阵按照指定列进行排序。该函数返回排序后的矩阵,并且可以通过第二个输出参数获取排序前的原序号。例如,对于一个矩阵A,可以使用\[b, ind\] = sortrows(A, 2)来按照第二列对矩阵进行排序,并且ind将会返回排序前的原序号。这样,b将是排序后的矩阵,ind将是排序前的原序号。
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相关问题
matlab sortrows
The sortrows function in MATLAB is used to sort a matrix or table based on one or more columns. The syntax for the function is:
```matlab
B = sortrows(A, cols)
```
where A is the matrix or table to be sorted, cols is a vector of column indices specifying the order of sorting. For example, if cols = [3 1], the matrix will be sorted first by the values in column 3, and then by the values in column 1.
The output B is a sorted version of A. If A is a matrix, B is also a matrix. If A is a table, B is a table with the same variable names and properties as A.
Here's an example of using sortrows to sort a matrix:
```matlab
A = [5 4 3; 2 1 6; 7 8 9];
B = sortrows(A, [2 1]);
```
In this case, the matrix A is sorted first by column 2, and then by column 1. The result B is:
```
B =
2 1 6
5 4 3
7 8 9
```
matlab sortrows函数
sortrows函数是MATLAB中用于按照指定列的值对矩阵进行排序的函数。
语法:
B = sortrows(A, cols)
其中,A是要排序的矩阵,cols是一个向量,指定要按照哪些列进行排序。B是排序后的矩阵。
例如,对于一个3行4列的矩阵A:
A = [4 2 3 1;
6 8 1 9;
7 5 2 0];
如果要按照第3列的值进行排序,可以使用:
B = sortrows(A, 3);
排序后的B矩阵为:
B = [7 5 2 0;
4 2 3 1;
6 8 1 9];
如果要按照第1列和第4列的值进行排序,可以使用:
B = sortrows(A, [1 4]);
排序后的B矩阵为:
B = [4 2 3 1;
7 5 2 0;
6 8 1 9];
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