Discrete Poisson equation: Difference between revisions
→On a twodimensional rectangular grid
(→Methods of Solution: correction per WP:MOS) 

respectively.
From the above, it can be inferred that there are <math>n</math> block columns of <math> m </math> in <math> A </math>. It is important to note that prescribed values of <math> u </math> (usually lying on the boundary) would have their corresponding elements removed from <math> I </math> and <math> D </math>. For the common case that all the nodes on the boundary are set, we have <math> 2 \le i \le m  1 </math> and <math> 2 \le j \le n  1 </math>, and the system would have the dimensions (''m'' &
== Example ==
