Matlab Functions - sort

sort

Matlab Functions List

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• B = sort(A,<dim>,<dir>) 将 A 中元素沿维数 dim 排列

  • dir 指示排列方向, 可填 'ascend' 或 'descend', 默认为升序 'ascend'

  • dim 需为整数, 默认为第一个非 1 的维数

  • 沿维数 dim 的意思是 (若为升序):

$\begin{aligned} \bm{A}(x_1,\underset{dim\text{th arg}}{\cdots,1,\cdots},x_n) &\leq \bm{A}(x_1,\underset{dim\text{th arg}}{\cdots,2,\cdots},x_n)\\ & \leq \cdots\\ & \leq \bm{A}(x_1,\underset{dim\text{th arg}}{\cdots,end,\cdots},x_n) \end{aligned}

• 特例:
  • If A is a vector, then sort(A) sorts the vector elements
  • If A is a matrix, then sort(A) treats the columns of A as vectors and sorts each column
  • if A is a matrix, then sort(A,2) sorts the elements of each row

- `B = sort(___,Name,Value)` specifies additional parameters for sorting - For example, `sort(A,'ComparisonMethod','abs')` sorts the elements of _A_ by magnitude. - `[B,I] = sort(___)` - _I_ 为描述 _A_ 重排情况的**索引数组** - 对于 vector 有 _B_ = `A(I)` - 对于高维数组则需要更复杂的操作才能从 _I_ 得到排序后数组