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.