tuple_select_ranktuple_select_rankTupleSelectRankTupleSelectRanktuple_select_rank (算子)

名称

tuple_select_ranktuple_select_rankTupleSelectRankTupleSelectRanktuple_select_rank — 选择元组中排名 n 的元素。

签名

描述

tuple_select_ranktuple_select_rankTupleSelectRankTupleSelectRankTupleSelectRanktuple_select_rank sorts the elements of the tuple TupleTupleTupleTupletupletuple and returns the element of rank n in SelectedSelectedSelectedSelectedselectedselected. RankIndexRankIndexRankIndexRankIndexrankIndexrank_index determines the index of the element to select. Thus, RankIndexRankIndexRankIndexRankIndexrankIndexrank_index may only contain integer values (any floating point number in RankIndexRankIndexRankIndexRankIndexrankIndexrank_index must represent an integer value without fraction). Indices of tuple elements start at 0, i.e. the lowest tuple element has the index 0.

例外：空输入元组

If RankIndexRankIndexRankIndexRankIndexrankIndexrank_index is empty, the operator returns an empty tuple.

HDevelop 内联操作

HDevelop provides an in-line operation for tuple_select_ranktuple_select_rankTupleSelectRankTupleSelectRankTupleSelectRanktuple_select_rank, which can be used in an expression in the following syntax:

Selected := select_rank(Tuple, RankIndex)

执行信息

• 多线程类型：独立（即使使用独占算子也能并行运行）。
• 多线程作用域：全局（可从任何线程调用）。
• 未采用并行化处理。

参数

替代

tuple_sort_indextuple_sort_indexTupleSortIndexTupleSortIndexTupleSortIndextuple_sort_index, tuple_sorttuple_sortTupleSortTupleSortTupleSorttuple_sort

另见

tuple_mediantuple_medianTupleMedianTupleMedianTupleMediantuple_median, tuple_selecttuple_selectTupleSelectTupleSelectTupleSelecttuple_select

模块

基础