A command like "unique" for matrices?

Hi guys,

Is there any command like "unique" for matrices?

I have a major matrice (mother) , and that involve few minor matrices, some of are repeated randomly

i'm looking for a command for delete repeated ones and do something like unique ,

anybody knows how?

[madhan ravi]

Well without illustration it’s not clear , sounds like unique is what you need. Better an example with an explicit example would be great.

[Andrei Bobrov]

Please post an example of your matrix and what you want to receive.

[Amy Hs]

thanks for your reply

see,

we have 3 matrices,

A=[1;2;3]  ; B=[1;2;3] ; C=[4;5;6];

all of them are in another matrice (call it R)

R={A;B;C}

as you see A & B 's first column are the same,

i want to delete one of them (A or B) and the result must be like below:

R={A;C}

Answer 1

[Stephen23]

A general solution that does not concatenate the data and works for any size arrays:

% Fake data:
A = [1;2;3];
B = [1;2;3];
C = [4;5;6];
R = {A;B;C}
% Method:
N = numel(R);
X = false(1,N);
for ii=2:N
    Y=false;
    for jj=1:ii-1
        Y = Y || isequal(R{ii},R{jj});
    end
    X(ii) = Y;
end
R(X) = []

[Amy Hs]

thanks a lot

Answer 2

[Andrei Bobrov]

A=[1;2;3];
C=[4;5;6];

M = [repmat(A,2,1);C];
out = reshape(unique(reshape(M,3,[])','rows','stable')',[],1);

[Amy Hs]

thanks a lot