Divide group into subgroups

I have a matrix 5x5 and i managed from this matrix to create a matrix 5x10 by creating a subgroup of 2 in each column.

So Matrix =

0 0 0 1 0 0 0 0 0 0
1 0 0 0 0 0 0 0 0 0
0 0 1 0 0 0 0 0 0 0
0 0 0 0 0 1 0 0 0 0
0 0 0 0 0 0 0 0 0 1

I want to tell that row 1 belongs to group 2, row 2 belongs to group 1, row 3 belongs to group 2, row 4 belongs to group 3 and row 5 belongs to group 5!

Thank you so much

Answer 1

[Azzi Abdelmalek]

group=[2 1 2 3 5]

the variable group indicate what you want

[N.]

I don't have a variable called group! I want to create this vector

[Walter Roberson]

group=[2 1 2 3 5] is an assignment statement, in which you define that the first entry is group 2, the second is group 1, and so on. You would create that variable using whatever information allowed you to tell us that those were the group numbers when you described the problem.

[N.]

The group thing is the information that i want to get, its not a thing that i would define.

[Azzi Abdelmalek]

Ok, then based on what you can tell one row or another belong to any group?

[Azzi Abdelmalek]

Maybe this is what you want

A=[0 0 0 1 0 0 0 0 0 0
1 0 0 0 0 0 0 0 0 0
0 0 1 0 0 0 0 0 0 0
0 0 0 0 0 1 0 0 0 0
0 0 0 0 0 0 0 0 0 1]
n=size(A,1);
a=any(reshape(A,n,2,[]),2)
b=a(:,:);
for k=1:n
  group(k)=find(b(k,:),1)
end

Answer 2

[Walter Roberson]

group = sum( Matrix(1:2:end) | Matrix(2:2:end) .* repmat( 1:size(Matrix,2)/2, size(Matrix,1), 1), 2);

Note: this may give unexpected answers if you have multiple 1's in the same row.