Add elements of array A to array B and ensure there is no repeated element in B?

1 次查看（过去 30 天）
Xiaohan Du
Xiaohan Du 2018-7-10
评论： Xiaohan Du 2018-7-10
Hi all,
If I have arrays A and B, and I'd like to add elements of array A into array B, during this process, B is actively checked to ensure there is no repeated elements in B, how can I do it?
Many thanks!
  2 个评论
Xiaohan Du
Xiaohan Du 2018-7-10
For example:
A = [2 3 4]; % before adding
B = [5 4 3 1 3]; % add B to A, has to be an iterative check
% because in my code elements of B is generated iteratively,
% not all at once.
A_output = [2 3 4 5 1]; % after adding, no repeated element

请先登录，再进行评论。

请先登录，再回答此问题。

回答（2 个）

KSSV
KSSV 2018-7-10
A = rand(10,1) ;
B = rand(10,1) ;
%%check for B
[C,ia,ib] = unique(B) ;
if length(C)==length(B)
fprintf('B has no repeated elements\n') ;
R = A+C ;
else
fprintf('B has repeated elements\n') ;
end
  1 个评论
Xiaohan Du
Xiaohan Du 2018-7-10
I meant when adding elements of B into A, check if A has repeated elements. But anyway, this allows to find out if A has repeated elements.
So now there is the problem: if there is repeated element in A, how to remove it and continue to move and check?

请先登录，再进行评论。

Guillaume
Guillaume 2018-7-10
B = unique([B, A]); %assuming B and A are row vectors.
If you want to preserve the original ordering of elements:
B = unique([B, A], 'stable');

类别

在 Help Center 和 File Exchange 中查找有关 Matrices and Arrays 的更多信息

标签

Community Treasure Hunt

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

Start Hunting!

Translated by