Removing like terms in a matrix

Let say i have to matrix A and B and wanted to produce a matrix C with the different terms of A and B.

A = [1 2 3 4 5 6 7 8 9]
B = [2 4 5 8 9]

so that

 C = [1 3 6 7]

Answer 1

[Akira Agata]

ismember function can do this more easily, like:

A = [1 2 3 4 5 6 7 8 9];
B = [2 4 5 8 9];
idx = ismember(A,B);
C = A(~idx);

Answer 2

[Jan]

There is a specific command for this job:

C = setdiff(A, B)

Answer 3

[John BG]

hi there

this is John BG <mailto:[e-mail] [e-mail]>

1.

the data

A = [1 2 3 4 5 6 7 8 9]
B = [2 4 5 8 9]

2.

with intersect. an if also comes useful because in this case length(A)>length(B) but it may be you have A B such length(B)>length(A)

if length(A)>=length(B)
[a,b,v]=find(A==intersect(A,B)');
elseif length(B)>length(A)
[b,a,v]=find(B==intersect(A,B)');
end

    a =
         1
         2
         3
         4
         5
    b =
         2
         4
         5
         8
         9
    v =
      5×1 logical array
       1
       1
       1
       1
       1

3.

copy, just in case you don't want to change A and B

    A2=A;B2=B;

4.

remove common elements

    A2(b)=[];
    B2(a)=[];

    C=[A2 B2]

    C =
         1     3     6     7

if you find this answer useful would you please be so kind to consider marking my answer as Accepted Answer?

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thanks in advance

John BG

<mailto:[e-mail] [e-mail]>