Mathematica and Julia both seem relevant here.
Mma has TakeLargest (and Wolfram tends to think hard about names).
https://reference.wolfram.com/language/ref/TakeLargest.html
Julia's closest comparable is perhaps partialsortperm:
https://docs.julialang.org/en/v1/base/sort/#Base.Sort.partialsortperm
Alan Isaac



On 5/30/2021 4:40 AM, kangkai@mail.ustc.edu.cn wrote:
> Hi, Thanks for reply, I present some details below:
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