maxk from subset of array

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Orr Streicher
Orr Streicher le 17 Août 2021
Commenté : Yazan le 17 Août 2021
I would like to solve the following prblem:
Lets say i have the vector :v=[10,22,3,-5,8,6,100,30,12,9]
I want to find the indicies and the values of the k largest number from a given subset, e.g: if the indices of the subset are [1,3,5,8] and k=2 the function will return: values=[10,30], indices=[1,8].
There is any suggestion how to implemet it?

Réponse acceptée

Yazan le 17 Août 2021
clc, clear
v = [10,22,3,-5,8,6,100,30,12,9];
subIdx = [1,3,5,8];
k = 2;
% sort values and get corresponding indices
[val, idx] = sort(v(subIdx), 'descend');
% get only k values
val = val(1:k);
% get actual indices
Idx = subIdx(idx(1:k));
val = 1×2
30 10
Idx = 1×2
8 1
  2 commentaires
Orr Streicher
Orr Streicher le 17 Août 2021
Yazan le 17 Août 2021
You may also use Matlab native function maxk instead of sorting the values. This might save you some processing power.

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