If you created a matrix with
make matrix 1,1000,1000,10,10
this means, make a matrix, call it number 1, it will be 1000 units wide, 1000 units high, it will be 10 tiles across (called 0-9), and 10 tiles up (labelled 0-9).
Now if there are 10 tiles across, there are actually 11 x coordinates you can raise height.
So, each tile has 4 corners you can raise to any height.
So, as help says, to raise all of bottom left tile up 10 units, you have to raise all 4 corners at 0,0 1,0 0,1 1,1
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