i want to write a n*n matrix into single column

i have a matrix of n * n i want to arrange the same matrix in a single column with index like this

[2.3 3.5 4.5;
1.3  3.9  2.8;
3.6  5.9  2.7]

i want to see like this

1 1 2.3;
1 2 3.5;
1 3 4.5;
...

[SANJOY MONDAL]

thank you sir

Answer 1

[Walter Roberson]

[I, J] = ndgrid(1:size(TheMatrix,1), 1:size(TheMatrix,2));
[J(:), I(:), reshape(TheMatrix.',[],1)]