numpy.where(condition[, x, y]) Return elements, either from x or y, depending on condition

numpy.extract(condition, arr)

numpy.count_nonzero(a) Counts the number of non-zero values in the array a.

numpy.argmin(a, axis=None, out=None)

numpy.sort_complex(a)

ndarray.sort(axis=-1, kind='quicksort', order=None) Sort an array, in-place.

numpy.sort(a, axis=-1, kind='quicksort', order=None)

numpy.partition(a, kth, axis=-1, kind='introselect', order=None)

numpy.nanargmax(a, axis=None)

numpy.argwhere(a)