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# How to add the value of the 3 highest elements automatically from a vector?

조회 수: 3(최근 30일)
Eddy Iswardi 28 Mar 2020
댓글: Peng Li 28 Mar 2020
I want to add the 3 highest elements of 'y' to 'sk'. But I don't know what code to use to automatically add them. in this case, the elements in question are 12, 12, and 13. So that the value will be 12 + 9 = 21, 12 + 9 = 21, 13 + 9 = 22. This is my code
clc;
clear all;
x1=[1 2 3 4 5 6 7 8 9 10 11];
x2=[1 2 3 4 5 6 7 8 9 10 11];
y=[10 9 11 10 11 11 9 10 12 12 13];
sx=9;
and the result will be
y = [10 9 11 10 11 11 9 10 21 21 22]

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### 답변(3개)

Peng Li 28 Mar 2020
[~, ind] = sort(y);
y(ind(end-2, end)) = y(ind(ind-2, end)) + ax;
Should meet your need.

#### 댓글 수: 4

표시 이전 댓글 수: 1
Ameer Hamza 28 Mar 2020
There is a few typos in Peng's code. try it like this
[~, ind] = sort(y);
y(ind(end-2:end)) = y(ind(end-2:end)) + sx;
or like this with a bit simple indexing
[~, ind] = sort(y, 'descend');
y(ind(1:3)) = y(ind(1:3)) + sx;
Eddy Iswardi 28 Mar 2020
oke, thank you. It's work now.
Peng Li 28 Mar 2020
Thanks Ameer. Using cell phone lol

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J. Alex Lee 28 Mar 2020
like this?
[~,idx] = maxk(y,3)
y(idx) = y(idx) + sx
Are x1 and x2 irrelevant to your question?

#### 댓글 수: 1

Eddy Iswardi 28 Mar 2020
I get an error at 'maxk'
Undefined function or variable 'maxk'.
I use matlab 2016a

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Torsten 28 Mar 2020
[~,idx]=maxk(y,3);
y(idx)=y(idx)+sx;
y

#### 댓글 수: 3

Eddy Iswardi 28 Mar 2020
I get an error at 'maxk'
Undefined function or variable 'maxk'.
I use matlab 2016a
Torsten 28 Mar 2020
[~,idx] = sort(y,'descend');
y(idx(1:3))=y(idx(1:3))+sx;
y
Eddy Iswardi 28 Mar 2020
oke, thank you. It's work now.

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