Lecture 3 Finite Difference Method to Solve Elliptic Equation

In this lecture, implementation of the finite difference method (FDM) to solve elliptic equation is covered. In order to have more clarity about this method, an example of steady-state heat conduction in a two-dimensional domain is considered. This lecture covers only the implementation part. The solution part using Gauss-Seidel method will be covered in Lecture 4.

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how does this work if delta x does not equal delta y?