How to store data in a pre allocated array

I have a pre-allocated array. But I want to store in that array 2 values, but it gets overwritten and only stores the last value. How could I fix that?

Note: I'am comparing the values of the odd and even columns of a random matrix in a loop.

Matrix = randi([0, 1], [1000,1000]);
MatrixEven=Matrix(:,2:2:end);
MatrixOdd=Matrix(:,1:2:end);
[rows,columns]=size(MatrixEven);
[rows1,columns1]=size(Matrix);

Array_Result=NaN(rows1,columns1); %Same size as Matrix
for i=1:1:rows
    for j=1:1:columns 
        if MatrixOdd(i,j)==MatrixEven(i,j)
           Array_Result(i,j)=2;  % If equal stores two '2'
           Array_Result(i,j)=2;
        else
            Array_Result(i,j)=MatrixOdd(i,j); %If different, stores both values
            Array_Result(i,j)=MatrixEven(i,j);
        end
    end
end

Answer 1

[Jan]

Of course you overwrite the values, see:

           Array_Result(i,j)=2;
           Array_Result(i,j)=2;           

You cannot store two values in one element.

I guess you mean:

for i = 1:rows
    for j = 1:columns 
        j2 = (j - 1)*2 + 1;
        if MatrixOdd(i,j) == MatrixEven(i,j)
           Array_Result(i, j2)   = 2;  % If equal stores two '2'
           Array_Result(i, j2+1) = 2;
        else
            Array_Result(i, j2)   = MatrixOdd(i,j); %If different, stores both values
            Array_Result(i, j2+1) = MatrixEven(i,j);
        end
    end
end

A simpler code for the same result:

Result = Matrix;
Mask   = MatrixEven == MatrixOdd;
Result(repelem(Mask, 1, 2)) = 2;

[Alex]

Thank you very much!! That's what I was trying to do!

[Jan]

Fine.