How to make a unique vector

조회 수: 7 (최근 30일)
Yingquan Li
Yingquan Li 2011년 7월 6일
Hello. Given this vector:
a = [22 20 21 20 24 25 26 22]
I want it to return
[22 20 21 24 25 26]
The unique function works but, I don't want the array to increase in order. I'm new and thank you in advance.

답변 (4개)

D
D 2011년 7월 6일
Also, from stackoverflow (I don't remember where, but if I find the post, I'll link it):
[junk,index] = unique(a,'first'); % removes non-unique, saves order in "index"
a = a(sort(index)); % sorts according to index

Oleg Komarov
Oleg Komarov 2011년 7월 6일

Paulo Silva
Paulo Silva 2011년 7월 6일
a = [22 20 21 20 24 25 26 22] %your vector
b=unique(a); %get the unique ones
d=perms(b); %get all possible permutations of the vector values
%sort the rows so we can avoid the first one 20 21 ...
d=sortrows(d); %sort the rows
p=randi([2 size(d,1)]); %get a random row of the array
%you can also avoid the last one if you want by using the next line instead
%p=randi([2 size(d,1)-1]);
v=d(p,:) %get all the values from the row selected

Yingquan Li
Yingquan Li 2011년 7월 6일
Hey guys, I tried: for i = 1:length(a) for j = 2:length(a) if (a(i) == a(j)) a(j) = [] end end end
There was an error. I don't see what's wrong.
  댓글 수: 1
Sean de Wolski
Sean de Wolski 2011년 7월 6일
well you keep making a smaller by removing elements but the for-loop wants to go to it's original length.

댓글을 달려면 로그인하십시오.

카테고리

Help CenterFile Exchange에서 Matrices and Arrays에 대해 자세히 알아보기

태그

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by