# Intersect for multiple vectors

29 views (last 30 days)
Joel Schelander on 15 Apr 2021
Edited: Jan on 15 Apr 2021
I have three vectors in a for loop.
A=[1 2 3 7];
B=[2 2 4 6];
C=[1 3 2 5];
D=[];
I want to use intersect so that I will avoid elements that are common for the vectors. Like:
I wonder if there is a function for this? I read about mintersect, but I want to find all elements that exist in more than one vector
for i=1:length(A)
if intersect(A,B) || intersect(A,C) || intersect(B,C)
D(i)=0;
end
else
D(i)=1;
end
DGM on 15 Apr 2021
Edited: DGM on 15 Apr 2021
Something like this?
D=unique([intersect(A,B) intersect(A,C) intersect(B,C)])
and I guess if you wanted to mask off elements in a given vector that were in the set D, you could do that
Jan on 15 Apr 2021
The show code is not clear.
for i=1:length(A)
if intersect(A,B) || intersect(A,C) || intersect(B,C)
D(i)=0;
end
else % There is no IF for this ELSE ???
D(i)=1;
end
Neither the description in the original question, nor the code matchs the explanation given in the commen: "find elements that are common to at least two vectors"
Please case for asking clear question. The more confusing the question is, the more time you and the answering persons waste with not matching suggestions. You are not a beginner, but the code is for your master thesis.

Jan on 15 Apr 2021
Edited: Jan on 15 Apr 2021
If this is the goal: "find elements that are common to at least two vectors":
A = [1 2 3 7];
B = [2 2 4 6];
C = [1 3 2 5];
V = unique([A, B, C]);
D = V((ismember(V, A) + ismember(V, B) + ismember(V, C)) >= 2)
D = 1×3
1 2 3

### Categories

Find more on Loops and Conditional Statements in Help Center and File Exchange

R2017b

### Community Treasure Hunt

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

Start Hunting!