排序，搜索和计数(Sorting, searching, and counting)
排序(Sorting)
| method | description |
|---|---|
| sort(a[, axis, kind, order]) | 返回数组的排序副本。 |
| lexsort(keys[, axis]) | 使用键的序列执行间接稳定排序。 |
| argsort(a[, axis, kind, order]) | 返回将对数组进行排序的索引。 |
| ndarray.sort([axis, kind, order]) | 就地排序数组。 |
| msort(a) | 返回沿第一个指针排序的数组的副本。 |
| sort_complex(a) | 首先使用实部，然后使用虚部对复杂数组进行排序。 |
| partition(a, kth[, axis, kind, order]) | 返回数组的分区副本。 |
| argpartition(a, kth[, axis, kind, order]) | 使用kind关键字指定的算法，沿给定的指针执行间接分区。 |
Searching
| method | description |
|---|---|
| argmax(a[, axis, out]) | Returns the indices of the maximum values along an axis. |
| nanargmax(a[, axis]) | Return the indices of the maximum values in the specified axis ignoring NaNs. |
| argmin(a[, axis, out]) | Returns the indices of the minimum values along an axis. |
| nanargmin(a[, axis]) | Return the indices of the minimum values in the specified axis ignoring NaNs. |
| argwhere(a) | Find the indices of array elements that are non-zero, grouped by element. |
| nonzero(a) | Return the indices of the elements that are non-zero. |
| flatnonzero(a) | Return indices that are non-zero in the flattened version of a. |
| where(condition, [x, y]) | Return elements chosen from x or y depending on condition. |
| searchsorted(a, v[, side, sorter]) | Find indices where elements should be inserted to maintain order. |
| extract(condition, arr) | Return the elements of an array that satisfy some condition. |
Counting
| method | description |
|---|---|
| count_nonzero(a[, axis]) | Counts the number of non-zero values in the array a. |