Grid indicators for matrix data to a heat map

I need to create a x and y value grid for a heatmap where the values are for a 10x10 matrix and a output value is placed into the matrix so it looks something like this:

X Y Data

1 1

1 2

1 3

with x staying at 1 and y changing from 1-10 as y reaches 10 the next x is 2 and y 1-10 again until x is 10 until 10 for x and 10 for y is achieved. the data is a existing matrix just need to add the X and Ys