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Combining the matrix' values

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jan
jan el 26 de Mzo. de 2015
Respondida: Roger Stafford el 26 de Mzo. de 2015
is there any predefined function let us to combine the values in a matrix example: let A the original matrix
if true
A= 1 2
4 5
7 8
end
the result that i'm loking for is
if true
C= 1 1 1 1 2 2 2 2
4 4 5 5 4 4 5 5
7 8 7 8 7 8 7 8
end
  3 comentarios
James Tursa
James Tursa el 26 de Mzo. de 2015
So you want the columns of C to be all possible combinations of the elements of the rows of A?
dpb
dpb el 26 de Mzo. de 2015
Appears he's dividing the two values into 1/2^n groupings where n=1:nRows. That is the first new row is 2 subsets, the 2nd is 4, etc., ...
That said, other than coding a loop and repmat no magic solution leaps out at me at the moment...

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James Tursa
James Tursa el 26 de Mzo. de 2015
Editada: James Tursa el 26 de Mzo. de 2015
C = allcomb(A(1,:),A(:,2),A(:,3))'
You can find allcomb (by Jos) on the FEX:
Or more generally,
B = mat2cell(A,ones(1,size(A,1)),size(A,2));
C = allcomb(B{:})';

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Roger Stafford
Roger Stafford el 26 de Mzo. de 2015
I think the following generalizes what you have requested for a matrix, A, of arbitrary size:
[m,n] = size(A);
[J,I] = meshgrid(0:n*2^(m-1)-1,m-1:-1:0);
C = A(m*(mod(floor(J./2.^I),n)+1)-I);

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