combinations and their sum

A = [1 2;

1 2;

1 2

1 2];

m = size(A,1);

output = [];

for j = 1:2

output = [output; A(:,j)'];

for i = 1:m

output = [output; [A(1:i-1,j); A(i,3-j); A(i+1:end,j)]'];

end

end

sum=output

sumOutput = sum(output,2)

if you could run this code you can see

this code is missing few combinations like

1 1 2 2

1 2 1 2

1 2 2 1

2 2 1 1

2 1 2 1

2 1 1 2

took 1 and 2 digits to understand combinations clearly.

Is it possible to fix the above error?

Can I get a code for n rows and n columns?

Answer 1

[Sulaymon Eshkabilov]

Hi,

Here is a rather simple answer:

[A1,A2,A3,A4] = ndgrid([1 2 1 2]);
VERS = [A1(:), A2(:), A3(:), A4(:)]
SUM_VERS = sum(VERS, 2)

Good luck.