"plus/minus" sign operator

Hi

I have a row matrix which is like n=[x,y,z] I need to consider plus and minus signs at the same time and get a permutations of them. In conclusion I need that solutions

n=[x,y,z]
n=[-x,y,z]
n=[x,-y,z]
n=[x,y,-z]
n=[-x,-y,z]
n=[-x,y,-z]
n=[x,-y,-z]
n=[-x,-y,-z]

Answer 1

[Iain]

It depends what you want to do with it.

M = [1 1 1; 1 1 -1; 1 -1 1; 1 -1 -1; -1 1 1; -1 1 -1; -1 -1 1; -1 -1 -1];

Out = (M * Row')' ;

Each row of Out is what you want.

You might want to programatically generate M if you have more columns on your row.

[Iman Ansari]

[a b c]=meshgrid([-1 1]);
M=[a(:) b(:) c(:)];

[frwmetric]

thank you...

Answer 2

[C.J. Harris]

Not exactly elegant, but it works:

A = [1 2 3];
B = (dec2bin(0:2^length(A)-1) - '0');
C = sum(B .* repmat(A, 2^length(A), 1), length(A)) + sum(~B .* repmat(-A, 2^length(A), 1), length(A));